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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
quant-ph/9908001 | GuangCan Guo | Chuan-Wei Zhang, Chuan-Feng Li, Guang-Can Guo (University of Science
and Technology of China) | General Strategies for Discrimination of Quantum States | 8 Pages, No Figure, REVTeX | Phys. Lett. A 261 (1999) 25. | 10.1016/S0375-9601(99)00566-6 | null | quant-ph | null | We derive general discrimination of quantum states chosen from a certain set,
given initial $M$ copies of each state, and obtain the matrix inequality, which
describe the bound between the maximum probability of correctly determining and
that of error. The former works are special cases of our results.
| [
{
"version": "v1",
"created": "Sat, 31 Jul 1999 07:52:55 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Zhang",
"Chuan-Wei",
"",
"University of Science\n and Technology of China"
],
[
"Li",
"Chuan-Feng",
"",
"University of Science\n and Technology of China"
],
[
"Guo",
"Guang-Can",
"",
"University of Science\n and Technology of China"
]
] |
quant-ph/9908002 | GuangCan Guo | Chuan-Wei Zhang, Chuan-Feng Li, Guang-Can Guo | Realization of Probabilistic Identification and Clone of Quantum-States
II Multiparticles System | 18 Pages, 3 Figures, ReVTeX | null | null | null | quant-ph | null | We realize the probabilistic cloning and identifying linear independent
quantum states of multi-particles system, given prior probability, with
universal quantum logic gates using the method of unitary representation. Our
result is universal for separate state and entanglement. We also provide the
realization in the condition given $M$ initial copies for each state.
| [
{
"version": "v1",
"created": "Sat, 31 Jul 1999 08:39:27 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Zhang",
"Chuan-Wei",
""
],
[
"Li",
"Chuan-Feng",
""
],
[
"Guo",
"Guang-Can",
""
]
] |
quant-ph/9908003 | GuangCan Guo | Chuan-Wei Zhang, Chuan-Feng Li, and Guang-Can Guo (University of
Science and Technology of China) | Quantum Clone and States Estimation for n-state System | 4 Pages, No Figure | Phys. Lett. A 271 (2000) 31 | 10.1016/S0375-9601(00)00352-2 | null | quant-ph | null | We derive a lower bound for the optimal fidelity for deterministic cloning a
set of n pure states. In connection with states estimation, we obtain a lower
bound about average maximum correct states estimation probability.
| [
{
"version": "v1",
"created": "Sat, 31 Jul 1999 08:57:22 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Aug 1999 02:55:18 GMT"
},
{
"version": "v3",
"created": "Sat, 22 Jan 2000 08:35:45 GMT"
},
{
"version": "v4",
"created": "Wed, 14 Jun 2000 08:54:58 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Zhang",
"Chuan-Wei",
"",
"University of\n Science and Technology of China"
],
[
"Li",
"Chuan-Feng",
"",
"University of\n Science and Technology of China"
],
[
"Guo",
"Guang-Can",
"",
"University of\n Science and Technology of China"
]
] |
quant-ph/9908004 | Sougato Bose | S. Bose, P. L. Knight, M. B. Plenio, V. Vedral | Proposal for teleportation of an atomic state via cavity decay | Version to appear in PRL (Dec). Small changes including title | null | 10.1103/PhysRevLett.83.5158 | null | quant-ph | null | We show how the state of an atom trapped in a cavity can be teleported to a
second atom trapped in a distant cavity simply by detecting photon decays from
the cavities. This is a rare example of a decay mechanism playing a
constructive role in quantum information processing. The scheme is
comparatively easy to implement, requiring only the ability to trap a single
three level atom in a cavity.
| [
{
"version": "v1",
"created": "Sun, 1 Aug 1999 16:07:21 GMT"
},
{
"version": "v2",
"created": "Mon, 6 Dec 1999 02:31:01 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Bose",
"S.",
""
],
[
"Knight",
"P. L.",
""
],
[
"Plenio",
"M. B.",
""
],
[
"Vedral",
"V.",
""
]
] |
quant-ph/9908005 | JeongHyeong Park | JeongHyeong Park and Dae-Yup Song | Berry phase in the simple harmonic oscillator | LaTex, 1 figure | null | null | null | quant-ph | null | Berry phase of simple harmonic oscillator is considered in a general
representation. It is shown that, Berry phase which depends on the choice of
representation can be defined under evolution of the half of period of the
classical motions, as well as under evolution of the period. The Berry phases
do {\em not} depend on the mass or angular frequency of the oscillator. The
driven harmonic oscillator is also considered, and the Berry phase is given in
terms of Fourier coefficients of the external force and parameters which
determine the representation.
| [
{
"version": "v1",
"created": "Sun, 1 Aug 1999 16:39:26 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Park",
"JeongHyeong",
""
],
[
"Song",
"Dae-Yup",
""
]
] |
quant-ph/9908006 | Benni Reznik | Alonso Botero and Benni Reznik | Quantum Communication Protocol Employing Weak Measurements | 5 pages, Revtex, 1 figure. A second protocol is added, where by a
similar set of weak measurement Alice can send, instead of receiving, a
message to Bob. The security question for the latter protocol is discussed | Phys. Rev. A 61, 050301 (R), (2000). | 10.1103/PhysRevA.61.050301 | null | quant-ph | null | We propose a communication protocol exploiting correlations between two
events with a definite time-ordering: a) the outcome of a {\em weak
measurement} on a spin, and b) the outcome of a subsequent ordinary measurement
on the spin. In our protocol, Alice, first generates a "code" by performing
weak measurements on a sample of N spins.
The sample is sent to Bob, who later performs a post-selection by measuring
the spin along either of two certain directions. The results of the
post-selection define the "key', which he then broadcasts publicly. Using both
her previously generated code and this key, Alice is able to infer the {\em
direction} chosen by Bob in the post-selection. Alternatively, if Alice
broadcasts publicly her code, Bob is able to infer from the code and the key
the direction chosen by Alice for her weak measurement. Two possible
experimental realizations of the protocols are briefly mentioned.
| [
{
"version": "v1",
"created": "Sun, 1 Aug 1999 23:49:09 GMT"
},
{
"version": "v2",
"created": "Mon, 27 Sep 1999 08:48:05 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Botero",
"Alonso",
""
],
[
"Reznik",
"Benni",
""
]
] |
quant-ph/9908007 | Jun Ye | J. Ye, D. W. Vernooy, H. J. Kimble | Trapping of single atoms in cavity QED | 4 pages, 4 figures | null | 10.1103/PhysRevLett.83.4987 | null | quant-ph | null | By integrating the techniques of laser cooling and trapping with those of
cavity quantum electrodynamics (QED), single Cesium atoms have been trapped
within the mode of a small, high finesse optical cavity in a regime of strong
coupling. The observed lifetime for individual atoms trapped within the cavity
mode is $\tau \approx 28$ms, and is limited by fluctuations of light forces
arising from the far-detuned intracavity field. This initial realization of
trapped atoms in cavity QED should enable diverse protocols in quantum
information science.
| [
{
"version": "v1",
"created": "Mon, 2 Aug 1999 00:49:45 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Ye",
"J.",
""
],
[
"Vernooy",
"D. W.",
""
],
[
"Kimble",
"H. J.",
""
]
] |
quant-ph/9908008 | Erich Joos | Erich Joos | Elements of Environmental Decoherence | Latex, 16 pages. To be published in the proceedings of the Bielefeld
conference on ``Decoherence: Theoretical, Experimental, and Conceptual
Problems", edited by P. Blanchard, D. Giulini, E. Joos, C. Kiefer, and I.-O.
Stamatescu (Springer 1999) | null | null | null | quant-ph | null | In this contribution I give a brief introduction to the essential concepts
and mechanisms of decoherence by the environment. The emphasis will be not so
much on technical details but rather on conceptual issues and the impact on the
interpretation problem of quantum theory.
| [
{
"version": "v1",
"created": "Mon, 2 Aug 1999 12:26:36 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Joos",
"Erich",
""
]
] |
quant-ph/9908009 | Dagomir Kaszlikowski | Dagomir Kaszlikowski, Marek Zukowski | Bell theorem involving all possible local measurements | null | null | 10.1103/PhysRevA.61.022114 | null | quant-ph | null | The Bell theorem for a pair of two-state systems in a singlet state is
formulated for the entire range of measurement settings.
| [
{
"version": "v1",
"created": "Mon, 2 Aug 1999 16:44:35 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Kaszlikowski",
"Dagomir",
""
],
[
"Zukowski",
"Marek",
""
]
] |
quant-ph/9908010 | Daniel Gottesman | Daniel Gottesman and Isaac L. Chuang | Quantum Teleportation is a Universal Computational Primitive | 6 pages, REVTeX, 6 epsf figures | Nature 402, 390-393 (1999) | 10.1038/46503 | null | quant-ph | null | We present a method to create a variety of interesting gates by teleporting
quantum bits through special entangled states. This allows, for instance, the
construction of a quantum computer based on just single qubit operations, Bell
measurements, and GHZ states. We also present straightforward constructions of
a wide variety of fault-tolerant quantum gates.
| [
{
"version": "v1",
"created": "Mon, 2 Aug 1999 21:36:39 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Gottesman",
"Daniel",
""
],
[
"Chuang",
"Isaac L.",
""
]
] |
quant-ph/9908011 | Ole Steuernagel | Ole Steuernagel | Uncertainty is complementary to Complementarity | 3 pages, 2 figures | null | null | null | quant-ph | null | For any ideal two-path interferometer it is shown that the wave-particle
duality of quantum mechanics implies Heisenberg's uncertainty relation and vice
versa. It is conjectured that complementarity and uncertainty are two aspects
of the same general principle.
| [
{
"version": "v1",
"created": "Tue, 3 Aug 1999 12:55:41 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Steuernagel",
"Ole",
""
]
] |
quant-ph/9908012 | Ching-Hua Tseng | C. H. Tseng, S. Somaroo, Y. Sharf, E. Knill, R. Laflamme, T. F. Havel,
D. G. Cory | Quantum simulation of a three-body interaction Hamiltonian on an NMR
quantum computer | 5 pages, 1 figure | null | 10.1103/PhysRevA.61.012302 | null | quant-ph | null | Extensions of average Hamiltonian theory to quantum computation permit the
design of arbitrary Hamiltonians, allowing rotations throughout a large Hilbert
space. In this way, the kinematics and dynamics of any quantum system may be
simulated by a quantum computer. A basis mapping between the systems dictates
the average Hamiltonian in the quantum computer needed to implement the desired
Hamiltonian in the simulated system. The flexibility of the procedure is
illustrated with NMR on 13-C labelled Alanine by creating the non-physical
Hamiltonian ZZZ corresponding to a three body interaction.
| [
{
"version": "v1",
"created": "Tue, 3 Aug 1999 13:40:33 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Tseng",
"C. H.",
""
],
[
"Somaroo",
"S.",
""
],
[
"Sharf",
"Y.",
""
],
[
"Knill",
"E.",
""
],
[
"Laflamme",
"R.",
""
],
[
"Havel",
"T. F.",
""
],
[
"Cory",
"D. G.",
""
]
] |
quant-ph/9908013 | Abel Camacho Quintana | A. Camacho (Astrophysikalisches Institut Potsdam) | Measurement-induced interference in an inhomogeneous gravitational field | 15 pages, accepted in Physics Letters A | Phys.Lett. A262 (1999) 110-120 | 10.1016/S0375-9601(99)00565-4 | null | quant-ph gr-qc | null | A very interesting quantum mechanical effect is the emergence of
gravity-induced interference, which has already been detected. This effect also
shows us that gravity is at the quantum level not a purely geometric effect,
the mass of the employed particles appears explicitly in the interference
expression. In this work we will generalize some previous results. It will be
shown that the introduction of a second order approximation in the propagator
of a particle, immersed in the Earth's gravitational field, and whose
coordinates are being continuously monitored, allows us to include, in the
corresponding complex oscillator, a frequency which now depends on the geometry
of the source of the gravitational field, a fact that is absent in the case of
a homogeneous field. Using this propagator we will analyze the interference
pattern of two particle beams whose coordinates are being continuously
monitored. We will compare our results againt the case of a homogeneous field,
and also against the measurement ouputs of the Colella, Overhauser, and Werner
experiment, and find that the difference in the dependence upon the geometry of
the source of the gravitational field could render detectable differences in
their respective measurement outputs.
| [
{
"version": "v1",
"created": "Tue, 3 Aug 1999 17:04:22 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Camacho",
"A.",
"",
"Astrophysikalisches Institut Potsdam"
]
] |
quant-ph/9908014 | Jan Govaerts | Jan Govaerts (Catholic Univ. Louvain) and Victor M. Villanueva (Univ.
Michoacan, Mexico) | Topology Classes of Flat U(1) Bundles and Diffeomorphic Covariant
Representations of the Heisenberg Algebra | 22 pages, no figures, plain LaTeX file; changes only in details of
affiliation and financial support | Int.J.Mod.Phys. A15 (2000) 4903-4932 | 10.1142/S0217751X00002846 | null | quant-ph hep-th math-ph math.MP | null | The general construction of self-adjoint configuration space representations
of the Heisenberg algebra over an arbitrary manifold is considered. All such
inequivalent representations are parametrised in terms of the topology classes
of flat U(1) bundles over the configuration space manifold. In the case of
Riemannian manifolds, these representations are also manifestly diffeomorphic
covariant. The general discussion, illustrated by some simple examples in non
relativistic quantum mechanics, is of particular relevance to systems whose
configuration space is parametrised by curvilinear coordinates or is not simply
connected, which thus include for instance the modular spaces of theories of
non abelian gauge fields and gravity.
| [
{
"version": "v1",
"created": "Wed, 4 Aug 1999 09:13:37 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Sep 1999 09:14:02 GMT"
}
] | 2016-12-28T00:00:00 | [
[
"Govaerts",
"Jan",
"",
"Catholic Univ. Louvain"
],
[
"Villanueva",
"Victor M.",
"",
"Univ.\n Michoacan, Mexico"
]
] |
quant-ph/9908015 | Castagnoli Giuseppe | Giuseppe Castagnoli, Dalida Monti, and Alexander Sergienko | Performing Quantum Measurement in Suitably Entangled States Originates
the Quantum Computation Speed Up | 22 pages, RevTex, 1 PostScript file with figures. Some comments might
indicate ineffective communication of the former version. The description of
the mechanism of the quantum speed-up should now be clearer. An Overview of a
few pages has been provided | null | null | null | quant-ph | null | We provide a justification of the quantum speed-up based on the complementary
roles played by the reversible preparation of an entangled state before
measurement and by the final measurement action.
| [
{
"version": "v1",
"created": "Wed, 4 Aug 1999 09:56:35 GMT"
},
{
"version": "v2",
"created": "Mon, 14 Feb 2000 13:31:24 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Castagnoli",
"Giuseppe",
""
],
[
"Monti",
"Dalida",
""
],
[
"Sergienko",
"Alexander",
""
]
] |
quant-ph/9908016 | Yeranuhi Hakobyan | Ye. Hakobyan, S. Ter-Antonyan, V. Ter-Antonyan | Quantum Parabolic Sombrero | 10 pages, LaTex, 6 figures (eps). accepted in Phys. Lett. A | Phys.Lett. A264 (2000) 434-439 | 10.1016/S0375-9601(99)00832-4 | null | quant-ph hep-th math-ph math.MP | null | We have discussed the energy levels and probability distribution density for
a quantum particle placed in the two-dimensional sombrero-shaped potential
$V(\rho,\rho_0)=\mu\omega^2|\rho^2-\rho_0^2|/2$.
| [
{
"version": "v1",
"created": "Wed, 4 Aug 1999 12:52:04 GMT"
},
{
"version": "v2",
"created": "Sat, 27 Nov 1999 11:41:33 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Hakobyan",
"Ye.",
""
],
[
"Ter-Antonyan",
"S.",
""
],
[
"Ter-Antonyan",
"V.",
""
]
] |
quant-ph/9908017 | Dr. Arun Kumar Pati | Arun Kumar Pati | Probabilistic exact cloning and probabilistic no-signalling | Latex file, 6 pages, minor corrections | null | 10.1016/S0375-9601(00)00281-4 | null | quant-ph | null | We show that non-local resources cannot be used for probabilistic signalling
even if one can produce exact clones with the help of a probabilistic quantum
cloning machine (PQCM). We show that PQCM cannot help to distinguish two
statistical mixtures at a remote location. Thus quantum theory rules out the
possibility of sending superluminal signals not only deterministically but also
probabilistically. We give a bound on the success probability of producing
multiple clones in an entangled system.
| [
{
"version": "v1",
"created": "Wed, 4 Aug 1999 13:17:57 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Aug 1999 11:39:28 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Pati",
"Arun Kumar",
""
]
] |
quant-ph/9908018 | Michael Wilkinson | Michael Wilkinson and Michael A. Morgan | Non-adiabatic transitions in multi-level systems | 25 pages RevTeX, 9 figures and 4 tables as Postscipt files | null | 10.1103/PhysRevA.61.062104 | null | quant-ph | null | In a quantum system with a smoothly and slowly varying Hamiltonian, which
approaches a constant operator at times $t\to \pm \infty$, the transition
probabilities between adiabatic states are exponentially small. They are
characterized by an exponent that depends on a phase integral along a path
around a set of branch points connecting the energy level surfaces in complex
time. Only certain sequences of branch points contribute. We propose that these
sequences are determined by a topological rule involving the Stokes lines
attached to the branch points. Our hypothesis is supported by theoretical
arguments and results of numerical experiments.
| [
{
"version": "v1",
"created": "Wed, 4 Aug 1999 14:20:33 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Wilkinson",
"Michael",
""
],
[
"Morgan",
"Michael A.",
""
]
] |
quant-ph/9908019 | Guy Potvin | Guy Potvin (Defense Research Establishment Valcartier) | Dualist interpretation of quantum mechanics | 17 pages, no figures, RevTex, corrected typos and Eq. (21) (but does
not affect conclusions). Also, discusses some old ideas in greater detail and
introduces new ones, references added, DREV website: http://www.drev.dnd.ca/ | null | null | null | quant-ph cond-mat.stat-mech | null | An interpretation of quantum mechanics is proposed which augments the
stochastic pilot-wave model, introduced by Nelson [E. Nelson, Phys. Rev., 150,
1079 (1966)], with a dual guidance condition. Namely, in addition to the
stochastic guidance condition which describes how the wave controls the
particle (wave-to-particle guidance condition), we introduce another stochastic
guidance condition describing how the particle guides the wave
(particle-to-wave guidance condition). We therefore introduce an
action-reaction principle in the pilot-wave formulation of quantum mechanics.
The particle-to-wave guidance condition takes the form of spontaneous
transitions of the wavefunction that are Poisson distributed in time. The
wavefunction selected by the transition is influenced by its likelyhood with
respect to the particle position, as well as certain conservation constraints.
It is shown that the stochastic particle-to-wave guidance condition reproduces
certain aspects of the spontaneous localization model of Ghirardi, Rimini and
Weber [G. C. Ghirardi, A. Rimini and T. Weber, Phys. Rev. D, 34, 470 (1986)],
and of Milburn's intrinsic decoherence model [G. J. Milburn, Phys. Rev. A, 44,
5401 (1991)], while avoiding some of the difficulties associated with them. The
macroscopic limit of the dualist interpretation is analyzed for the case of a
free body. Possible improvements of this interpretation are discussed.
| [
{
"version": "v1",
"created": "Wed, 4 Aug 1999 16:54:53 GMT"
},
{
"version": "v2",
"created": "Fri, 6 Aug 1999 18:32:09 GMT"
},
{
"version": "v3",
"created": "Wed, 1 Dec 1999 16:04:43 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Potvin",
"Guy",
"",
"Defense Research Establishment Valcartier"
]
] |
quant-ph/9908020 | Anil K. Patnaik | Anil K. Patnaik (Physical Research Laboratory, Ahmedabad, India) and
G. S. Agarwal (Physical Research Laboratory, Ahmedabad, India and
Max-Plank-Institut f\"ur Quantenoptik, Garching, Germany) | Laser Field Induced Birefringence and Enhancement of Magneto-optical
Rotation | 9 pages including 4 Figures | Optics Commun. vol. 179, pg. 97-106 (2000) | 10.1016/S0030-4018(99)00530-1 | null | quant-ph | null | An initially isotropic medium, when subjected to either a magnetic field or a
coherent field, can induce anisotropy in the medium and can cause the
polarization of a probe field to rotate. Therefore the rotation of probe
polarization, due to magnetic field alone, can be controlled efficiently with
the use of a coherent control field. We demonstrate this enhancement of the
magneto-optical rotation (MOR) of a linearly polarized light, by doing detailed
calculations on a system with relevant transitions $j=0\leftrightarrow
j=1\leftrightarrow j=0$.
| [
{
"version": "v1",
"created": "Wed, 4 Aug 1999 18:00:26 GMT"
}
] | 2016-08-15T00:00:00 | [
[
"Patnaik",
"Anil K.",
"",
"Physical Research Laboratory, Ahmedabad, India"
],
[
"Agarwal",
"G. S.",
"",
"Physical Research Laboratory, Ahmedabad, India and\n Max-Plank-Institut für Quantenoptik, Garching, Germany"
]
] |
quant-ph/9908021 | Tetsufumi Tanamoto | Tetsufumi Tanamoto (Toshiba Corporation) | Quantum gates by coupled quantum dots and measurement procedure in Si
MOSFET | 3 pages, 2 figures, use revtex.sty. 'The Eleventh International
Conference on Nonequilibrium Carrier Dynamics in Semiconductors
(HCIS-11)',July 19-23, 1999 | Physica B 272 (1999) 45 | 10.1016/S0921-4526(99)00344-0 | null | quant-ph | null | We investigated the quantum gates of coupled quantum dots, theoretically,
when charging effects can be observed. We have shown that the charged states in
the qubits can be observed by the channel current of the MOSFET structure.
| [
{
"version": "v1",
"created": "Thu, 5 Aug 1999 02:18:29 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Tanamoto",
"Tetsufumi",
"",
"Toshiba Corporation"
]
] |
quant-ph/9908022 | Alberto Carlini | A. Carlini and A. Hosoya | Carmichael Numbers on a Quantum Computer | 7 pages, Latex/REVTEX file | null | null | TIT/HEP-427/COSMO-95 | quant-ph | null | We present a quantum probabilistic algorithm which tests with a polynomial
computational complexity whether a given composite number is of the Carmichael
type. We also suggest a quantum algorithm which could verify a conjecture by
Pomerance, Selfridge and Wagstaff concerning the asymptotic distribution of
Carmichael numbers smaller than a given integer.
| [
{
"version": "v1",
"created": "Thu, 5 Aug 1999 09:13:22 GMT"
}
] | 2009-09-25T00:00:00 | [
[
"Carlini",
"A.",
""
],
[
"Hosoya",
"A.",
""
]
] |
quant-ph/9908023 | Mladen Pavicic | Harry Paul and Mladen Pavicic | Nonclassical interaction-free detection of objects in a monolithic
total-internal-reflection resonator | RevTeX, 13 pages, 4 ps figures, author's www:
http://m3k.grad.hr/pavicic | J. Opt. Soc. Am. B, 14 (1997) 1275-1279 | 10.1364/JOSAB.14.001275 | null | quant-ph | null | We show that with an efficiency exceeding 99% one can use a monolithic
total-internal-reflection resonator in order to ascertain the presence of an
object without transferring a quantum of energy to it. We also propose an
experiment on the probabilistic meaning of the electric field that contains
only a very few photons.
| [
{
"version": "v1",
"created": "Thu, 5 Aug 1999 19:48:36 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Paul",
"Harry",
""
],
[
"Pavicic",
"Mladen",
""
]
] |
quant-ph/9908024 | Mladen Pavicic | Mladen Pavicic | Spin-correlated interferometry with beam splitters: preselection of
spin-correlated photons | RevTeX, 19 pages, 3 ps figures, author's www:
http://m3k.grad.hr/pavicic | J. Opt. Soc. Am. B, 12 (1995) 821-828 | 10.1364/JOSAB.12.000821 | null | quant-ph | null | A nonclassical feature of the fourth-order interference at a beam splitter,
that genuine photon spin singlets are emitted in predetermined directions even
when incident photons are unpolarized, has been used in a proposal for an
experiment that imposes quantum spin correlation on truly independent photons.
In the experiment, two photons from two such singlets interfere at a beam
splitter, and as a result the other two photons - which nowhere interacted and
whose paths nowhere crossed - exhibit a 100% correlation in polarization, even
when no polarization has been measured in the first two photons. The propsed
experiment permits closure of the remaining loopholes in the Bell theorem proof
and reveals the quantum nonlocality as a property of selection, and pioneers an
experimental procedure for exact preparation of unequal superposition.
| [
{
"version": "v1",
"created": "Thu, 5 Aug 1999 20:56:23 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Pavicic",
"Mladen",
""
]
] |
quant-ph/9908025 | Emmanuel Paspalakis | Emmanuel Paspalakis | Physical Interpretation of Laser-Induced Suppression of Quantum
Tunneling | 4 pages text, 1 figure. Submitted for publication | null | 10.1016/S0375-9601(99)00630-1 | null | quant-ph | null | We revisit the problem of laser-induced suppression of quantum dynamical
tunneling in a model system studied by Kilin et al. [Phys. Rev. Lett. 76 (1996)
3297]. This quantum system consists of a ground state symmetric double-well
potential which is coupled by a strong laser field to an excited state
asymmetric double-well potential. By analyzing the assumptions used in their
analysis we show that the suppression of quantum dynamical tunneling can be
explained with the use of dark and bright states of the system. We also
generalize the system and the conditions for suppression of quantum tunneling
and show that, in certain cases, suppression can occur regardless the
characteristics of the excited potential surface.
| [
{
"version": "v1",
"created": "Fri, 6 Aug 1999 11:55:29 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"Paspalakis",
"Emmanuel",
""
]
] |
quant-ph/9908026 | Emmanuel Paspalakis | E. Paspalakis, N. J. Kylstra and P. L. Knight | Transparency Near a Photonic Band Edge | 3 pages text, 2 figures | Physical Review A, Vol. 60, R33-R36 (1999) | 10.1103/PhysRevA.60.R33 | null | quant-ph | null | We study the absorption and dispersion properties of a ${\bf \Lambda}$-type
atom which decays spontaneously near the edge of a photonic band gap (PBG).
Using an isotropic PBG model, we show that the atom can become transparent to a
probe laser field, even when other dissipative channels are present. This
transparency originates from the square root singularity of the density of
modes of the PBG material at threshold.
| [
{
"version": "v1",
"created": "Fri, 6 Aug 1999 13:47:15 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Paspalakis",
"E.",
""
],
[
"Kylstra",
"N. J.",
""
],
[
"Knight",
"P. L.",
""
]
] |
quant-ph/9908027 | null | C.R. Hagen | Galilean Lee Model of the Delta Function Potential | 7 pages, latex, no figures | null | 10.1103/PhysRevA.61.032715 | null | quant-ph hep-th math-ph math.MP | null | The scattering cross section associated with a two dimensional delta function
has recently been the object of considerable study. It is shown here that this
problem can be put into a field theoretical framework by the construction of an
appropriate Galilean covariant theory. The Lee model with a standard Yukawa
interaction is shown to provide such a realization. The usual results for delta
function scattering are then obtained in the case that a stable particle exists
in the scattering channel provided that a certain limit is taken in the
relevant parameter space. In the more general case in which no such limit is
taken finite corrections to the cross section are obtained which (unlike the
pure delta function case) depend on the coupling constant of the model.
| [
{
"version": "v1",
"created": "Fri, 6 Aug 1999 16:37:27 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Hagen",
"C. R.",
""
]
] |
quant-ph/9908028 | Hans Halvorson | Rob Clifton (Depts. of Philosophy and History & Philosophy of Science,
University of Pittsburgh) and Hans Halvorson (Depts. of Mathematics and
Philosophy, University of Pittsburgh) | Bipartite Mixed States of Infinite-Dimensional Systems are Generically
Nonseparable | 5 pages, RevTeX | Phys. Rev. A 61, 012108 (2000) | 10.1103/PhysRevA.61.012108 | null | quant-ph | null | Given a bipartite quantum system represented by a tensor product of two
Hilbert spaces, we give an elementary argument showing that if either component
space is infinite-dimensional, then the set of nonseparable density operators
is trace-norm dense in the set of all density operators (and the separable
density operators nowhere dense). This result complements recent detailed
investigations of separability, which show that when both component Hilbert
spaces are finite-dimensional, there is a separable neighborhood (perhaps very
small for large dimensions) of the maximally mixed state.
| [
{
"version": "v1",
"created": "Sun, 8 Aug 1999 17:22:47 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Clifton",
"Rob",
"",
"Depts. of Philosophy and History & Philosophy of Science,\n University of Pittsburgh"
],
[
"Halvorson",
"Hans",
"",
"Depts. of Mathematics and\n Philosophy, University of Pittsburgh"
]
] |
quant-ph/9908029 | David Marcus Appleby | D. M. Appleby | Bohmian Trajectories Post-Decoherence | 21 pages, AMS Latex | Found.Phys. 29 (1999) 1885-1916 | null | QMW-PH-99-11 | quant-ph | null | The proposal that the interaction between a macroscopic body and its
environment plays a crucial role in producing the correct classical limit in
the Bohm interpretation of quantum mechanics is investigated, in the context of
a model of quantum Brownian motion. It is well known that one of the effects of
the interaction is to produce an extremely rapid approximate diagonalisation of
the reduced density matrix in the position representation. This effect is, by
itself, insufficient to produce generically quasi-classical behaviour of the
Bohmian trajectory. However, it is shown that, if the system particle is
initially in an approximate energy eigenstate, then there is a tendency for the
Bohmian trajectory to become approximately classical on a rather longer
time-scale. The relationship between this phenomenon and the behaviour of the
Wigner function post-decoherence (as analysed by Halliwell and Zoupas) is
discussed. It is also suggested that the phenomenon may be related to the
storage of information about the trajectory in the environment, and that it may
therefore be a general feature of every situation in which such environmental
monitoring occurs.
| [
{
"version": "v1",
"created": "Sun, 8 Aug 1999 22:26:34 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Appleby",
"D. M.",
""
]
] |
quant-ph/9908030 | Tommaso Calarco | Tommaso Calarco (1), Marcello Cini (2), and Roberto Onofrio (3)
((1)Institut fuer Theoretische Physik - Universitaet Innsbruck and ECT*
(Trento); (2) Dipartimento di Fisica - Universita' di Roma "La Sapienza" and
INFN, Sezione di Roma; (3) Dipartimento di Fisica "G. Galilei" -Universita'
di Padova and INFM, Sezione di Roma 1) | Are violations to temporal Bell inequalities there when somebody looks? | 7 pages, 1 eps figure, needs europhys.sty and euromacr.tex, enclosed
in the .tar.gz file; accepted for publication in Europhysics Letters | null | 10.1209/epl/i1999-00403-3 | ECT*-99-006 | quant-ph | null | The possibility of observing violations of temporal Bell inequalities,
originally proposed by Leggett as a mean of testing the quantum mechanical
delocalization of suitably chosen macroscopic bodies, is discussed by taking
into account the effect of the measurement process. A general criterion
quantifying this possibility is defined and shown not to be fulfilled by the
various experimental configurations proposed so far to test inequalities of
different forms.
| [
{
"version": "v1",
"created": "Mon, 9 Aug 1999 09:09:18 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Calarco",
"Tommaso",
""
],
[
"Cini",
"Marcello",
""
],
[
"Onofrio",
"Roberto",
""
]
] |
quant-ph/9908031 | Adrian Kent | Rob Clifton (Depts of Philosophy and History and Philosophy of
Science, University of Pittsburgh) and Adrian Kent (Centre for Quantum
Computation, University of Oxford and DAMTP, University of Cambridge) | Simulating Quantum Mechanics by Non-Contextual Hidden Variables | 15 pages. Journal version. Only minor typo corrections from last
version | Proc. Roy. Soc. Lond. A (2000) 456, 2101-2114. | 10.1098/rspa.2000.0604 | DAMTP-1999-95 | quant-ph | null | No physical measurement can be performed with infinite precision. This leaves
a loophole in the standard no-go arguments against non-contextual hidden
variables. All such arguments rely on choosing special sets of
quantum-mechanical observables with measurement outcomes that cannot be
simulated non-contextually. As a consequence, these arguments do not exclude
the hypothesis that the class of physical measurements in fact corresponds to a
dense subset of all theoretically possible measurements with outcomes and
quantum probabilities that \emph{can} be recovered from a non-contextual hidden
variable model. We show here by explicit construction that there are indeed
such non-contextual hidden variable models, both for projection valued and
positive operator valued measurements.
| [
{
"version": "v1",
"created": "Mon, 9 Aug 1999 12:24:26 GMT"
},
{
"version": "v2",
"created": "Tue, 24 Aug 1999 09:15:45 GMT"
},
{
"version": "v3",
"created": "Fri, 18 Feb 2000 15:19:29 GMT"
},
{
"version": "v4",
"created": "Mon, 29 May 2000 22:03:14 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Clifton",
"Rob",
"",
"Depts of Philosophy and History and Philosophy of\n Science, University of Pittsburgh"
],
[
"Kent",
"Adrian",
"",
"Centre for Quantum\n Computation, University of Oxford and DAMTP, University of Cambridge"
]
] |
quant-ph/9908032 | Micho Durdevich | Micho Durdevich | Physics Beyond the Limits of Uncertainty Relations | AMSLaTeX, 8 pages. An online version of the paper is available at the
Author's website. Visit http://www.matem.unam.mx/~micho for more details | null | null | null | quant-ph math.QA | null | The paper is a brief informal introduction to C*-algebraic foundations of
causal contextual subquantum theories. In particular, it is explained how the
contextuality property (which is a necessary consistency condition of all
causal subquantum theories) naturally appears within the framework of certain
C*-algebraic extensions of the quantum observables algebras. Furthermore, a
question of locality is discussed. It is explained that the appropriate
non-Kolmogorovian probability theory allows us to unify both locality and
causality with the principles of quantum mechanics, overcoming the obstacles
given by Bell's inequalities.
| [
{
"version": "v1",
"created": "Tue, 10 Aug 1999 01:55:31 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Durdevich",
"Micho",
""
]
] |
quant-ph/9908033 | Eric A. Galapon | Eric A. Galapon (Theoretical Physics Group, National Institute of
Physics, University of the Philippines at Diliman) | Pauli's Theorem and Quantum Canonical Pairs: The Consistency Of a
Bounded, Self-Adjoint Time Operator Canonically Conjugate to a Hamiltonian
with Non-empty Point Spectrum | contains corrections to minor typographical errors of the published
version | Proc. R. Soc. Lond. A, 458 (2002) 451-472 | 10.1098/rspa.2001.0874 | null | quant-ph math-ph math.MP | null | In single Hilbert space, Pauli's well-known theorem implies that the
existence of a self-adjoint time operator canonically conjugate to a given
Hamiltonian signifies that the time operator and the Hamiltonian possess
completely continuous spectra spanning the entire real line. Thus the
conclusion that there exists no self-adjoint time operator conjugate to a
semibounded or discrete Hamiltonian despite some well-known illustrative
counterexamples. In this paper we evaluate Pauli's theorem against the single
Hilbert space formulation of quantum mechanics, and consequently show the
consistency of assuming a bounded, self-adjoint time operator canonically
conjugate to a Hamiltonian with an unbounded, or semibounded, or finite point
spectrum. We point out Pauli's implicit assumptions and show that they are not
consistent in a single Hilbert space. We demonstrate our analysis by giving two
explicit examples. Moreover, we clarify issues sorrounding the different
solutions to the canonical commutation relations, and, consequently, expand the
class of acceptable canonical pairs beyond the solutions required by Pauli's
theorem.
| [
{
"version": "v1",
"created": "Wed, 11 Aug 1999 08:24:24 GMT"
},
{
"version": "v2",
"created": "Tue, 28 Sep 1999 17:59:57 GMT"
},
{
"version": "v3",
"created": "Wed, 21 Jun 2000 12:12:03 GMT"
},
{
"version": "v4",
"created": "Fri, 5 Apr 2002 08:21:27 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Galapon",
"Eric A.",
"",
"Theoretical Physics Group, National Institute of\n Physics, University of the Philippines at Diliman"
]
] |
quant-ph/9908034 | Antonio Vidiella-Barranco | H. Moya-Cessa, J.A. Roversi, S.M. Dutra, A. Vidiella-Barranco
(Universidade Estadual de Campinas) | Recovering coherence from decoherence: a method of quantum state
reconstruction | 8 pages, in RevTeX, 4 figures, accepted for publication in Phys. Rev.
A (november 1999) | Phys. Rev. A 60, 4029 (1999). | 10.1103/PhysRevA.60.4029 | null | quant-ph | null | We present a feasible scheme for reconstructing the quantum state of a field
prepared inside a lossy cavity. Quantum coherences are normally destroyed by
dissipation, but we show that at zero temperature we are able to retrieve
enough information about the initial state, making possible to recover its
Wigner function as well as other quasiprobabilities. We provide a numerical
simulation of a Schroedinger cat state reconstruction.
| [
{
"version": "v1",
"created": "Wed, 11 Aug 1999 13:14:27 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Moya-Cessa",
"H.",
"",
"Universidade Estadual de Campinas"
],
[
"Roversi",
"J. A.",
"",
"Universidade Estadual de Campinas"
],
[
"Dutra",
"S. M.",
"",
"Universidade Estadual de Campinas"
],
[
"Vidiella-Barranco",
"A.",
"",
"Universidade Estadual de Campinas"
]
] |
quant-ph/9908035 | Morgan W. Mitchell | Ari Mizel, M. W. Mitchell, and Marvin L. Cohen | Ground State Quantum Computation | 4 pages, 2 figures | null | 10.1103/PhysRevA.63.040302 | null | quant-ph | null | We formulate a novel ground state quantum computation approach that requires
no unitary evolution of qubits in time: the qubits are fixed in stationary
states of the Hamiltonian. This formulation supplies a completely
time-independent approach to realizing quantum computers. We give a concrete
suggestion for a ground state quantum computer involving linked quantum dots.
| [
{
"version": "v1",
"created": "Wed, 11 Aug 1999 21:15:53 GMT"
}
] | 2013-05-29T00:00:00 | [
[
"Mizel",
"Ari",
""
],
[
"Mitchell",
"M. W.",
""
],
[
"Cohen",
"Marvin L.",
""
]
] |
quant-ph/9908036 | Gerard Milburn | Samuel L.Braunstein, Giacomo M.D'Ariano, G.J.Milburn, and Massimiliano
F. Sacchi | Universal teleportation with a twist | 4 pages, 1 figure | Phys. Rev. Lett. 84, 3486 (2000) | 10.1103/PhysRevLett.84.3486 | null | quant-ph | null | We give a transfer theorem for teleportation based on twisting the
entanglement measurement. This allows one to say what local unitary operation
must be performed to complete the teleportation in any situation, generalizing
the scheme to include overcomplete measurements, non-abelian groups of local
unitary operations (e.g., angular momentum teleportation), and the effect of
non-maximally entangled resources.
| [
{
"version": "v1",
"created": "Thu, 12 Aug 1999 05:22:38 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Braunstein",
"Samuel L.",
""
],
[
"D'Ariano",
"Giacomo M.",
""
],
[
"Milburn",
"G. J.",
""
],
[
"Sacchi",
"Massimiliano F.",
""
]
] |
quant-ph/9908037 | Gerard Milburn | G.J.Milburn | Simulating nonlinear spin models in an ion trap | 4 pages | null | null | null | quant-ph | null | We show how a conditional displacement of the vibrational mode of trapped
ions can be used to simulate nonlinear collective and interacting spin systems
including nonlinear tops and Ising models (a universal two qubit gate),
independent of the vibrational state of the ion. Thus cooling to the
vibrational ground state is unnecessary provided the heating rate is not too
large.
| [
{
"version": "v1",
"created": "Thu, 12 Aug 1999 06:00:16 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Milburn",
"G. J.",
""
]
] |
quant-ph/9908038 | Victor Dodonov | V.V.Dodonov and M.A.Andreata | Squeezing and photon distribution in a vibrating cavity | 20 pages, LaTex2e, iopart document class, 2 ps figures, accepted for
publication in J. Phys. A | J. Phys. A, v.32, no.39, p.6711-6726 (1999) | 10.1088/0305-4470/32/39/301 | null | quant-ph | null | We obtain explicit analytical expressions for the quadrature variances and
the photon distribution functions of the electromagnetic field modes excited
from vacuum or thermal states due to the non-stationary Casimir effect in an
ideal one-dimensional Fabry--Perot cavity with vibrating walls, provided the
frequency of vibrations is close to a multiple frequency of the fundamental
unperturbed electromagnetic mode.
| [
{
"version": "v1",
"created": "Thu, 12 Aug 1999 13:34:41 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Dodonov",
"V. V.",
""
],
[
"Andreata",
"M. A.",
""
]
] |
quant-ph/9908039 | Jose L. Cereceda | Jose L. Cereceda | Quantum perfect correlations and Hardy's nonlocality theorem | LaTeX, 24 pages, 1 figure | Found. Phys. Lett. 12 (1999) 211-231 | null | null | quant-ph | null | In this paper the failure of Hardy's nonlocality proof for the class of
maximally entangled states is considered. A detailed analysis shows that the
incompatibility of the Hardy equations for this class of states physically
originates from the fact that the existence of quantum perfect correlations for
the three pairs of two-valued observables (D_11,D_21), (D_11,D_22) and
(D_12,D_21) [in the sense of having with certainty equal (different) readings
for a joint measurement of any one of the pairs (D_11,D_21), (D_11,D_22), and
(D_12,D_21)], necessarily entails perfect correlation for the pair of
observables (D_12,D_22) [in the sense of having with certainty equal
(different) readings for a joint measurement of the pair (D_12,D_22)]. Indeed,
the set of these four perfect correlations is found to satisfy the CHSH
inequality, and then no violations of local realism will arise for the
maximally entangled state as far as the four observables D_ij, i,j = 1,2, are
concerned. The connection between this fact and the impossibility for the
quantum mechanical predictions to give the maximum possible theoretical
violation of the CHSH inequality is pointed out. Moreover, it is generally
proved that the fulfillment of all the Hardy nonlocality conditions necessarily
entails a violation of the resulting CHSH inequality. The largest violation of
this latter inequality is determined.
| [
{
"version": "v1",
"created": "Thu, 12 Aug 1999 18:29:32 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Cereceda",
"Jose L.",
""
]
] |
quant-ph/9908040 | Andrei N. Soklakov | A. N. Soklakov and R. Schack | Classical limit in terms of symbolic dynamics for the quantum baker's
map | 12 pages, LaTex, typos corrected | Phys. Rev. E 61, 5108 (2000) | 10.1103/PhysRevE.61.5108 | null | quant-ph | null | We derive a simple closed form for the matrix elements of the quantum baker's
map that shows that the map is an approximate shift in a symbolic
representation based on discrete phase space. We use this result to give a
formal proof that the quantum baker's map approaches a classical Bernoulli
shift in the limit of a small effective Plank's constant.
| [
{
"version": "v1",
"created": "Thu, 12 Aug 1999 21:44:36 GMT"
},
{
"version": "v2",
"created": "Sun, 15 Jul 2001 23:34:48 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"Soklakov",
"A. N.",
""
],
[
"Schack",
"R.",
""
]
] |
quant-ph/9908041 | Luis Santos | Luis Santos and Dagmar Bruss | Reversible quantum teleportation in an optical lattice | 8 pages, 3 figures | J. Phys. A: Math. Gen. 34, 7003 (2001) | 10.1088/0305-4470/34/35/326 | null | quant-ph | null | We propose a protocol, based on entanglement procedures recently suggested by
[D. Jaksch et al., Phys. Rev. Lett. 82, 1975 (1999)], which allows the
teleportation of an unknown state of a neutral atom in an optical lattice to
another atom in another site of the lattice, without any irreversible
detection.
| [
{
"version": "v1",
"created": "Fri, 13 Aug 1999 09:08:59 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Santos",
"Luis",
""
],
[
"Bruss",
"Dagmar",
""
]
] |
quant-ph/9908042 | Dr. V. Krasnoholovets | Volodymyr Krasnoholovets | On the Way to Submicroscopic Description of Nature | LaTeX 2e, 13 pages, 1 figure (PostScript file); minor changes have
been made | Indian Journal of Theoretical Physics, vol. 49, no. 2, pp. 81-95
(2001) | null | null | quant-ph | null | The outline analyzes the principal difficulties, which emerge at the applying
of modern quantum theory based on the Copenhagen School concept to phenomena
developed in the range close to 10^{-28} cm (the point of intersection of the
three fundamental interactions). It is shown that at this scale, the
interaction of a moving particle with space plays an essential role and just
space assigns wave and quantum properties to the particle. The main physical
aspects of space structure are discussed herein.
| [
{
"version": "v1",
"created": "Fri, 13 Aug 1999 10:10:04 GMT"
},
{
"version": "v2",
"created": "Wed, 3 Nov 1999 08:37:26 GMT"
},
{
"version": "v3",
"created": "Fri, 5 Nov 1999 09:42:45 GMT"
},
{
"version": "v4",
"created": "Tue, 9 Oct 2001 09:34:06 GMT"
}
] | 2009-09-25T00:00:00 | [
[
"Krasnoholovets",
"Volodymyr",
""
]
] |
quant-ph/9908043 | Seth Lloyd | Seth Lloyd (MIT) | Ultimate physical limits to computation | 22 pages, plain TeX, submitted to Nature, replaced to incorporate
additional content and references | null | 10.1038/35023282 | null | quant-ph | null | Computers are physical systems: what they can and cannot do is dictated by
the laws of physics. In particular, the speed with which a physical device can
process information is limited by its energy and the amount of information that
it can process is limited by the number of degrees of freedom it possesses.
This paper explores the physical limits of computation as determined by the
speed of light $c$, the quantum scale $\hbar$ and the gravitational constant
$G$. As an example, quantitative bounds are put to the computational power of
an `ultimate laptop' with a mass of one kilogram confined to a volume of one
liter.
| [
{
"version": "v1",
"created": "Fri, 13 Aug 1999 14:04:55 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Aug 1999 10:53:26 GMT"
},
{
"version": "v3",
"created": "Mon, 14 Feb 2000 22:41:43 GMT"
}
] | 2015-06-26T00:00:00 | [
[
"Lloyd",
"Seth",
"",
"MIT"
]
] |
quant-ph/9908044 | Maria Jose Sanchez | A. J. Fendrik and M. J. S\'anchez | Semiclassical density of degeneracies in quantum regular systems | 25 pages, 7 figures . Submitted to PRE | null | 10.1088/0305-4470/33/12/303 | null | quant-ph | null | The spectrum of eigenenergies of a quantum integrable system whose
hamiltonian depends on a single parameter shows degeneracies (crossings) when
the parameter varies. We derive a semiclassical expression for the density of
crossings in the plane energy-parameter, that is the number of crossings per
unit of energy and unit of parameter, in terms of classical periodic orbits. We
compare the results of the semiclassical formula with exact quantum
calculations for two specific quantum integrable billiards.
| [
{
"version": "v1",
"created": "Fri, 13 Aug 1999 17:40:29 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Fendrik",
"A. J.",
""
],
[
"Sánchez",
"M. J.",
""
]
] |
quant-ph/9908045 | Dr P. K. Panigrahi | N. Gurappa, P.S. Mohanty and Prasanta K. Panigrahi | A novel realization of the Calogero-Moser scattering states as coherent
states | 9 pages, REVTeX | null | 10.1103/PhysRevA.61.034703 | null | quant-ph cond-mat hep-th | null | A novel realization is provided for the scattering states of the $N$-particle
Calogero-Moser Hamiltonian. They are explicitly shown to be the coherent states
of the singular oscillators of the Calogero-Sutherland model. Our algebraic
treatment is straightforwardly extendable to a large number of few and
many-body interacting systems in one and higher dimensions.
| [
{
"version": "v1",
"created": "Fri, 13 Aug 1999 20:36:35 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Gurappa",
"N.",
""
],
[
"Mohanty",
"P. S.",
""
],
[
"Panigrahi",
"Prasanta K.",
""
]
] |
quant-ph/9908046 | Leo Stodolsky | J. Anandan and L. Stodolsky | On the Relation Between Quantum Mechanical and Classical Parallel
Transport | 3 pages, no figures | Phys. Lett. A 266(2000)95-97 | 10.1016/S0375-9601(00)00013-X | MPI-PTh/99-34 | quant-ph math-ph math.DG math.MP | null | We explain how the kind of ``parallel transport'' of a wavefunction used in
discussing the Berry or Geometrical phase induces the conventional parallel
transport of certain real vectors. These real vectors are associated with
operators whose commutators yield diagonal operators; or in Lie algebras those
operators whose commutators are in the (diagonal) Cartan subalgebra.
| [
{
"version": "v1",
"created": "Sat, 14 Aug 1999 12:00:51 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Anandan",
"J.",
""
],
[
"Stodolsky",
"L.",
""
]
] |
quant-ph/9908047 | Vlatko Vedral | V. Vedral | On bound entanglement assisted distillation | 9 pages, no figures, minor typos corrected | Phys. Lett. A 262 (2-3) 121 (1999) | 10.1016/S0375-9601(99)00686-6 | null | quant-ph | null | We investigate asymptotic distillation of entanglement in the presence of an
unlimited amount of bound entanglement for bi-partite systems. We show that the
distillability is still bounded by the relative entropy of entanglement. This
offers a strong support to the fact that bound entanglement does not improve
distillation of entanglement.
| [
{
"version": "v1",
"created": "Sat, 14 Aug 1999 13:02:56 GMT"
},
{
"version": "v2",
"created": "Wed, 17 Nov 1999 14:49:19 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Vedral",
"V.",
""
]
] |
quant-ph/9908048 | Michael Martin Nieto | Michael Martin Nieto and D. Rodney Truax | Higher-Power Coherent and Squeezed States | 23 pages including 9 figures. To be published in Optics
Communications | Optics Com. 179, 197-213 (2000) | 10.1016/S0030-4018(99)00483-6 | LA-UR-99-1157 | quant-ph | null | A closed form expression for the higher-power coherent states (eigenstates of
$a^{j}$) is given. The cases j=3,4 are discussed in detail, including the
time-evolution of the probability densities. These are compared to the case
j=2, the even- and odd-coherent states. We give the extensions to the
"effective" displacement-operator, higher-power squeezed states and to the
ladder-operator/minimum-uncertainty, higher-power squeezed states. The
properties of all these states are discussed.
| [
{
"version": "v1",
"created": "Sun, 15 Aug 1999 01:01:26 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"Nieto",
"Michael Martin",
""
],
[
"Truax",
"D. Rodney",
""
]
] |
quant-ph/9908049 | Dmitri Horoshko | D. B. Horoshko and S. Ya. Kilin | Quantum Teleportation Using Quantum Non-Demolition Technique | 4 pages RevTeX, 2 figures | Phys. Rev. A 61, 032304 (2000) | 10.1103/PhysRevA.61.032304 | null | quant-ph | null | We propose a new scheme and protocol for quantum teleportation of a
single-mode field state, based on entanglement produced by quantum
non-demolition interaction. We show that the recently attained results in QND
technique allow to perform the teleportation in quantum regime. We also show
that applying QND coupling to squeezed fields will significantly improve the
quality of teleportation for a given degree of squeezing.
| [
{
"version": "v1",
"created": "Sun, 15 Aug 1999 10:50:09 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Horoshko",
"D. B.",
""
],
[
"Kilin",
"S. Ya.",
""
]
] |
quant-ph/9908050 | Robert B. Lockhart | Robert B.Lockhart | Optimal Ensemble Length of Mixed Separable States | 8 pages | null | 10.1063/1.1290055 | null | quant-ph | null | The optimal (pure state) ensemble length of a separable state, A, is the
minimum number of (pure) product states needed in convex combination to
construct A. We study the set of all separable states with optimal (pure state)
ensemble length equal to k or fewer. Lower bounds on k are found below which
these sets have measure 0 in the set of separable states. In the bipartite case
and the multiparticle case where one of the particles has significantly more
quantum numbers than the rest, the lower bound for non-pure state ensembles is
sharp. A consequence of our results is that for all two particle systems,
except possibly those with a qubit or those with a nine dimensional Hilbert
space, and for all systems with more than two particles the optimal pure state
ensemble length for a randomly picked separable state is with probability 1
greater than the state's rank. In bipartite systems with probability 1 it is
greater than 1/4 the rank raised to the 3/2 power and in a system with p qubits
with probability 1 it is greater than (2^2p)/(1+2p), which is almost the square
of the rank.
| [
{
"version": "v1",
"created": "Sun, 15 Aug 1999 18:29:05 GMT"
}
] | 2015-06-26T00:00:00 | [
[
"Lockhart",
"Robert B.",
""
]
] |
quant-ph/9908051 | Emanuel Knill | E. Knill, R. Laflamme, R. Martinez, C.-H. Tseng | A Cat-State Benchmark on a Seven Bit Quantum Computer | 6 pages with figures | null | null | null | quant-ph | null | We propose and experimentally realize an algorithmic benchmark that
demonstrates coherent control with a sequence of quantum operations that first
generates and then decodes the cat state (|000...>+|111...>)/sqrt(2) to the
standard initial state |000...>. This is the first high fidelity experimental
quantum algorithm on the currently largest physical quantum register, which has
seven quantum bits (qubits) provided by the nuclei of crotonic acid. The
experiment has the additional benefit of verifying a seven coherence in a
generic system of coupled spins. Our implementation combines numerous nuclear
magnetic resonance (NMR) techniques in one experiment and introduces practical
methods for translating quantum networks to control operations. The
experimental procedure can be used as a reliable and efficient method for
creating a standard pseudo-pure state, the first step for implementing
traditional quantum algorithms in liquid state NMR. The benchmark and the
techniques can be adapted for use on other proposed quantum devices.
| [
{
"version": "v1",
"created": "Sun, 15 Aug 1999 20:52:42 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Knill",
"E.",
""
],
[
"Laflamme",
"R.",
""
],
[
"Martinez",
"R.",
""
],
[
"Tseng",
"C. -H.",
""
]
] |
quant-ph/9908052 | Jaehyun Kim | Jaehyun Kim, Jae-Seung Lee, and Soonchil Lee | Implementing unitary operators in quantum computation | published version, 4 pages, 1 figure, REVTeX | Phys. Rev. A 61 (2000) 032312 | 10.1103/PhysRevA.61.032312 | null | quant-ph | null | We present a general method which expresses a unitary operator by the product
of operators allowed by the Hamiltonian of spin-1/2 systems. In this method,
the generator of an operator is found first, and then the generator is expanded
by the base operators of the product operator formalism. Finally, the base
operators disallowed by the Hamiltonian, including more than two-body
interaction operators, are replaced by allowed ones by the axes transformation
and coupling order reduction technique. This method directly provides pulse
sequences for the nuclear magnetic resonance quantum computer, and can be
generally applied to other systems.
| [
{
"version": "v1",
"created": "Mon, 16 Aug 1999 07:03:34 GMT"
},
{
"version": "v2",
"created": "Sat, 4 Sep 1999 05:24:49 GMT"
},
{
"version": "v3",
"created": "Wed, 16 Feb 2000 03:36:00 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Kim",
"Jaehyun",
""
],
[
"Lee",
"Jae-Seung",
""
],
[
"Lee",
"Soonchil",
""
]
] |
quant-ph/9908053 | Michal Horodecki | Czeslaw Lewa, Pawel Horodecki, Ryszard Horodecki, and Michal Horodecki | MR spectroscopy with parabolic magnetic field: spin-oscillator coupling
effect | RevTeX, 3 pages | null | null | null | quant-ph | null | The spectrum of the spin particle in oscillatory potential subjected to
external parabolic magnetic field ${\bf B}=(B_0+Gx+\tilde G x^2){\bf \hat z}$
is obtained. The structure of energy levels of the considered system allows to
identify the frequency of the oscillator via the spectrum of spin sublevels
coming only from {\it one} oscillatory level. The effect is due to the gradient
terms in the form of the field.
| [
{
"version": "v1",
"created": "Mon, 16 Aug 1999 12:32:57 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lewa",
"Czeslaw",
""
],
[
"Horodecki",
"Pawel",
""
],
[
"Horodecki",
"Ryszard",
""
],
[
"Horodecki",
"Michal",
""
]
] |
quant-ph/9908054 | Shmuel Gurvitz | Brahim Elattari and S.A. Gurvitz | Effect of the measurement on the decay rate of a quantum system | Additional explanations are added. Accepted for publications in Phys.
Rev. Lett | Phys.Rev.Lett. 84 (2000) 2047-2051 | 10.1103/PhysRevLett.84.2047 | null | quant-ph cond-mat hep-ph nucl-th | null | We investigated the electron tunneling out of a quantum dot in the presence
of a continuous monitoring by a detector. It is shown that the Schr\"odinger
equation for the whole system can be reduced to new Bloch-type rate equations
describing the time-development of the detector and the measured system at
once. Using these equations we find that the continuous measurement of the
unstable system does not affect its exponential decay, $\exp (-\Gamma t)$,
contrary to expectations based on the Quantum Zeno effect . However, the width
of the energy distribution of the tunneling electron is no more $\Gamma$, but
increases due to the decoherence, generated by the detector.
| [
{
"version": "v1",
"created": "Mon, 16 Aug 1999 15:47:28 GMT"
},
{
"version": "v2",
"created": "Sun, 2 Jan 2000 08:55:31 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Elattari",
"Brahim",
""
],
[
"Gurvitz",
"S. A.",
""
]
] |
quant-ph/9908055 | Sunish Menon | Sunish Menon and G. S. Agarwal | Gain Components in Autler-Townes Doublet from Quantum Interferences in
Decay Channels | Total 8 pages, 6 figures, submitted to Physical Review A | null | 10.1103/PhysRevA.61.013807 | null | quant-ph | null | We consider non-degenerate pump-probe spectroscopy of V-systems under
conditions such that interference among decay channels is important. We
demonstrate how this interference can result in new gain features instead of
the usual absorption features. We relate this gain to the existence of a new
vacuum induced quasi-trapped-state. We further show how this also results in
large refractive index with low absorption.
| [
{
"version": "v1",
"created": "Mon, 16 Aug 1999 17:47:50 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Menon",
"Sunish",
""
],
[
"Agarwal",
"G. S.",
""
]
] |
quant-ph/9908056 | Lu Ming Duan | Lu-Ming Duan, G. Giedke, J. I. Cirac, P. Zoller | Inseparability criterion for continuous variable systems | minor changes in the introduction and refs | Phys. Rev. Lett. 84, 2722 (2000) | 10.1103/PhysRevLett.84.2722 | null | quant-ph | null | An inseparability criterion based on the total variance of a pair of
Einstein-Podolsky-Rosen type operators is proposed for continuous variable
systems. The criterion provides a sufficient condition for entanglement of any
two-party continuous variable states. Furthermore, for all the Gaussian states,
this criterion turns out to be a necessary and sufficient condition for
inseparability.
| [
{
"version": "v1",
"created": "Tue, 17 Aug 1999 08:13:31 GMT"
},
{
"version": "v2",
"created": "Fri, 24 Mar 2000 14:05:24 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Duan",
"Lu-Ming",
""
],
[
"Giedke",
"G.",
""
],
[
"Cirac",
"J. I.",
""
],
[
"Zoller",
"P.",
""
]
] |
quant-ph/9908057 | Yuri N. Morokov | Yu. N. Morokov | The Schwarz-Hora effect: present-day situation | 5 pages, RevTex, 2 PS figures | Proceedings of SPIE, "ICONO'98: Fundamental Aspects of
Laser-Matter Interaction and New Nonlinear Optical Materials and Physics of
Low-Dimensional Structures", 1999, v. 3734, pp. 34-40 | 10.1117/12.342384 | null | quant-ph | null | The electron-diffraction pattern at a nonfluorescent target was observed by
Schwarz under attempts to modulate an electron beam by laser light. The pattern
was of the same color as the laser light. The analysis of the literature shows
there are the unresolved up to now significant contradictions between the
theory and the Schwarz experiments. To resolve these contradictions, the
interpretation of the Schwarz-Hora effect is considered, which is a development
of the idea formulated by Schwarz and Hora. It is supposed that the interaction
of electrons with the laser field inside a thin dielectric film is accompanied
not only by the processes of absorption and stimulated emission of photons but
also by formation of some metastable electron states in which the captured
photons can be transferred with a following emission at the target.
| [
{
"version": "v1",
"created": "Tue, 17 Aug 1999 12:35:15 GMT"
}
] | 2015-06-26T00:00:00 | [
[
"Morokov",
"Yu. N.",
""
]
] |
quant-ph/9908058 | Juergen Reingruber | A. Actor, I. Bender, J. Reingruber | Casimir Effect on a Finite Lattice | Latex, 61 pages, 16 postscript figures | Fortsch.Phys. 48 (2000) 303-359 | 10.1002/(SICI)1521-3978(200004)48:4<303::AID-PROP303>3.0.CO;2-J | null | quant-ph | null | This article presents a Hamiltonian lattice formulation of static Casimir
systems at a level of generality appropriate for an introductory investigation.
Background structure - represented by a lattice potential V(x) - is introduced
along one spatial direction with translation invariance in all other spatial
directions. Following some general analysis two specific finite one dimensional
lattice QFT systems are analyzed in detail.
| [
{
"version": "v1",
"created": "Tue, 17 Aug 1999 15:43:58 GMT"
}
] | 2017-04-26T00:00:00 | [
[
"Actor",
"A.",
""
],
[
"Bender",
"I.",
""
],
[
"Reingruber",
"J.",
""
]
] |
quant-ph/9908059 | Michael Martin Nieto | Michael Martin Nieto | Electrons above a Helium Surface and the One-Dimensional Rydberg Atom | 9 pages. Additional material to address the referee's comments | Phys. Rev. A 61, No. 0344901 (2000) 4 pp. | 10.1103/PhysRevA.61.034901 | LA-UR-99-4097 | quant-ph cond-mat | null | Isolated electrons resting above a helium surface are predicted to have a
bound spectrum corresponding to a one-dimensional hydrogen atom. But in fact,
the observed spectrum is closer to that of a quantum-defect atom. Such a model
is discussed and solved in analytic closed form.
| [
{
"version": "v1",
"created": "Tue, 17 Aug 1999 20:26:17 GMT"
},
{
"version": "v2",
"created": "Wed, 17 Nov 1999 05:30:25 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Nieto",
"Michael Martin",
""
]
] |
quant-ph/9908060 | Chiao | Raymond Y. Chiao | Bogoliubov dispersion relation for a "photon fluid": Is this a
superfluid? | 11 pages, 4 figures, Scully Festschrift paper to appear in Optics
Communications | null | 10.1016/S0030-4018(99)00615-X | null | quant-ph cond-mat.stat-mech | null | We discuss the possibility that photons, which are bosons, can form a 2D
superfluid due to Bose-Einstein condensation inside a nonlinear Fabry-Perot
cavity filled with atoms in their ground states. A "photon fluid" forms inside
the cavity as a result of multiple photon-photon collisions mediated by the
atoms during a cavity ring-down time. The effective mass and chemical potential
for a photon inside this fluid are nonvanishing. This implies the existence of
a Bogoliubov dispersion relation for the low-lying elementary excitations of
the photon fluid, and in particular, that sound waves exist for
long-wavelength, low-frequency disturbances of this fluid. Possible experiments
to test for the superfluidity of the photon fluid based on the Landau
critical-velocity criterion will be discussed.
| [
{
"version": "v1",
"created": "Wed, 18 Aug 1999 00:10:24 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Chiao",
"Raymond Y.",
""
]
] |
quant-ph/9908061 | Scutaru Horia | Horia Scutaru | Transition probabilities between quasifree states | 13 pages, REVTeX, no figures | Journal of Mathematical Physics, 39, 6403 (1998) | 10.1063/1.532656 | null | quant-ph | null | We obtain a general formula for the transition probabilities between any
state of the algebra of the canonical commutation relations (CCR-algebra) and a
squeezed quasifree state. Applications of this formula are made for the case of
multimode thermal squeezed states of quantum optics using a general canonical
decomposition of the correlation matrix valid for any quasifree state. In the
particular case of a one mode CCR-algebra we show that the transition
probability between two quasifree squeezed states is a decreasing function of
the geodesic distance between the points of the upper half plane representing
these states. In the special case of the purification map it is shown that the
transition probability between the state of the enlarged system and the product
state of real and fictitious subsystems can be a measure for the entanglement.
| [
{
"version": "v1",
"created": "Wed, 18 Aug 1999 08:43:55 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Scutaru",
"Horia",
""
]
] |
quant-ph/9908062 | Shasanka Mohan Roy | S.M. Roy (Tata Institute of Fundamental Research) | Contextual Deterministic Quantum Mechanics | 7 pages,latex,no figs | Int.J.Mod.Phys.B14:2075-2082,2000 | 10.1142/S0217979200001217 | TIFR/TH/99-40 | quant-ph gr-qc hep-th | null | We present a simple proof of quantum contextuality for a spinless particle
with a one dimensional configuration space. We then discuss how the maximally
realistic deterministic quantum mechanics recently constructed by this author
and V. Singh can be applied to different contexts.
| [
{
"version": "v1",
"created": "Wed, 18 Aug 1999 13:11:38 GMT"
}
] | 2011-04-15T00:00:00 | [
[
"Roy",
"S. M.",
"",
"Tata Institute of Fundamental Research"
]
] |
quant-ph/9908063 | Mensky c/o Hellwig | Michael B. Mensky | Quantum Zeno effect in the decay onto an unstable level | 9 pages, LATEX | Physics Letters A 257, 227-231 (1999) | 10.1016/S0375-9601(99)00290-X | null | quant-ph | null | Under certain assumptions it is shown that the decay of level 2 of a
three-level system onto level 1 is slowed down because of the further decay of
level 1 onto level 0. It is argued that this phenomenon may be interpreted as a
consequence of the quantum Zeno effect. The reason why this may be possible is
that the second decay (or accompanying photon radiation) may be considered as a
sign of the transition 2 -> 1 so that during the first transition the system is
under continuous observation.
| [
{
"version": "v1",
"created": "Wed, 18 Aug 1999 18:22:41 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Mensky",
"Michael B.",
""
]
] |
quant-ph/9908064 | Dr. Daniel A. Lidar | Daniel A. Lidar, Dave Bacon, Julia Kempe and K.B. Whaley (UC Berkeley) | Decoherence-Free Subspaces for Multiple-Qubit Errors: (I)
Characterization | 18 pages, no figures. Major changes. Section on universal fault
tolerant computation removed. This section contained a crucial error. A new
paper [quant-ph/0007013] presents the correct analysis | Phys. Rev. A 63, 022306 (2001) | 10.1103/PhysRevA.63.022306 | null | quant-ph | null | Coherence in an open quantum system is degraded through its interaction with
a bath. This decoherence can be avoided by restricting the dynamics of the
system to special decoherence-free subspaces. These subspaces are usually
constructed under the assumption of spatially symmetric system-bath coupling.
Here we show that decoherence-free subspaces may appear without spatial
symmetry. Instead, we consider a model of system-bath interactions in which to
first order only multiple-qubit coupling to the bath is present, with
single-qubit system-bath coupling absent. We derive necessary and sufficient
conditions for the appearance of decoherence-free states in this model, and
give a number of examples. In a sequel paper we show how to perform universal
and fault tolerant quantum computation on the decoherence-free subspaces
considered in this paper.
| [
{
"version": "v1",
"created": "Thu, 19 Aug 1999 01:28:58 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Jul 2000 21:37:16 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"Lidar",
"Daniel A.",
"",
"UC Berkeley"
],
[
"Bacon",
"Dave",
"",
"UC Berkeley"
],
[
"Kempe",
"Julia",
"",
"UC Berkeley"
],
[
"Whaley",
"K. B.",
"",
"UC Berkeley"
]
] |
quant-ph/9908065 | Michal Horodecki | Michal Horodecki, Pawel Horodecki, and Ryszard Horodecki | Limits for entanglement measures | 4 pages, Revtex, typos corrected | Phys. Rev. Lett. 84 (2000) 2014 | 10.1103/PhysRevLett.84.2014 | null | quant-ph | null | We show that {\it any} entanglement measure $E$ suitable for the regime of
high number of entangled pairs satisfies $E_D\leq E\leq E_F$ where $E_D$ and
$E_F$ are entanglement of distillation and formation respectively. We also
exhibit a general theorem on bounds for distillable entanglement. The results
are obtained by use of a very transparent reasoning based on the fundamental
principle of entanglement theory saying that entanglement cannot increase under
local operations and classical communication.
| [
{
"version": "v1",
"created": "Thu, 19 Aug 1999 20:05:08 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Mar 2000 10:12:49 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Horodecki",
"Michal",
""
],
[
"Horodecki",
"Pawel",
""
],
[
"Horodecki",
"Ryszard",
""
]
] |
quant-ph/9908066 | Emanuel Knill | Emanuel Knill, Raymond Laflamme, Lorenza Viola | Theory of Quantum Error Correction for General Noise | 6 pages | null | null | null | quant-ph | null | Quantum error correction protects quantum information against environmental
noise. When using qubits, a measure of quality of a code is the maximum number
of errors that it is able to correct. We show that a suitable notion of
``number of errors'' e makes sense for any system in the presence of arbitrary
environmental interactions. In fact, the notion is directly related to the
lowest order in time with which uncorrectable errors are introduced, and this
in turn is derived from a grading of the algebra generated by the interaction
operators. As a result, e-error-correcting codes are effective at protecting
quantum information without requiring the usual assumptions of independence and
lack of correlation. We prove the existence of large codes for both quantum and
classical information. By viewing error-correcting codes as subsystems, we
relate codes to irreducible representations of certain operator algebras and
show that noiseless subsystems are infinite-distance error-correcting codes. An
explicit example involving collective interactions is discussed.
| [
{
"version": "v1",
"created": "Thu, 19 Aug 1999 22:43:44 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Knill",
"Emanuel",
""
],
[
"Laflamme",
"Raymond",
""
],
[
"Viola",
"Lorenza",
""
]
] |
quant-ph/9908067 | Liu | X.M.Liu and G.J.Milburn | Two dimensional nonlinear dynamics of evanescent-wave guiding atoms in
hollow fiber | 14 pages, 9 figures | null | null | null | quant-ph | null | This paper has been withdrawn due to same as quant-ph/9908068
| [
{
"version": "v1",
"created": "Fri, 20 Aug 1999 01:36:57 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Jan 2000 07:35:53 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Liu",
"X. M.",
""
],
[
"Milburn",
"G. J.",
""
]
] |
quant-ph/9908068 | Liu | X. M. Liu and G. J. Milburn | Two dimensional nonlinear dynamics of evanescent-wave guided atoms in
hollow fiber | 14pages, 9 figures | null | 10.1103/PhysRevA.61.053401 | null | quant-ph | null | We describe the classical and quantum two dimensional nonlinear dynamics of
large blue-detuned eveanescent-wave guiding cold atoms in hollow fiber. We show
that chaotic dynamics exists for classic dynamics, when the intensity of the
beam is periodically modulated. The two dimensional distributions of atoms in
(x,y) plane are simulated. We show that the atoms will accumulate on several
annular regions when the system enters a regime of global chaos. Our simulation
shows that, when the atomic flux is very small, a similar distribution will be
obtained if we detect the atomic distribution once each the modualtion period
and integrate the signals.
For quantum dynamics, quantum collapses and revivals appear . For
periodically modulated optical potential, the variance of atomic position will
be supressed compared to the no modulation case. The atomic angular momentum
will influnce the evolution of wave function in two dimensional quantum system
of hollow fiber.
| [
{
"version": "v1",
"created": "Fri, 20 Aug 1999 01:50:51 GMT"
},
{
"version": "v2",
"created": "Sun, 26 Dec 1999 12:00:47 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Liu",
"X. M.",
""
],
[
"Milburn",
"G. J.",
""
]
] |
quant-ph/9908069 | Alvaro L. | R. P. Mart\'inez-y-Romero, H. N. N\'u\~nez-Y\'epez, A. L. Salas-Brito | Relativistic quantum mechanics of a Dirac oscillator | 19 pages, 1 figure | Eur.J.Phys.16:135-141,1995 | 10.1088/0143-0807/16/3/008 | null | quant-ph math-ph math.MP physics.ed-ph | null | The Dirac oscillator is an exactly soluble model recently introduced in the
context of many particle models in relativistic quantum mechanics. The model
has been also considered as an interaction term for modelling quark confinement
in quantum chromodynamics. These considerations should be enough for
demonstrating that the Dirac oscillator can be an excellent example in
relativistic quantum mechanics. In this paper we offer a solution to the
problem and discuss some of its properties. We also discuss a physical picture
for the Dirac oscillator's non-standard interaction, showing how it arises on
describing the behaviour of a neutral particle carrying an anomalous magnetic
moment and moving inside an uniformly charged sphere.
| [
{
"version": "v1",
"created": "Sat, 21 Aug 1999 05:11:50 GMT"
}
] | 2016-08-15T00:00:00 | [
[
"Martínez-y-Romero",
"R. P.",
""
],
[
"Núñez-Yépez",
"H. N.",
""
],
[
"Salas-Brito",
"A. L.",
""
]
] |
quant-ph/9908070 | Barbara M. Terhal | David P. DiVincenzo, Tal Mor, Peter W. Shor, John A. Smolin and
Barbara M. Terhal | Unextendible Product Bases, Uncompletable Product Bases and Bound
Entanglement | 24 pages RevTex, 15 figures; appendix removed, several small
corrections, to appear in Comm. Math. Phys | Comm. Math. Phys. 238, pp. 379--410 (2003) | 10.1007/s00220-003-0877-6 | null | quant-ph | null | We report new results and generalizations of our work on unextendible product
bases (UPB), uncompletable product bases and bound entanglement. We present a
new construction for bound entangled states based on product bases which are
only completable in a locally extended Hilbert space. We introduce a very
useful representation of a product basis, an orthogonality graph. Using this
representation we give a complete characterization of unextendible product
bases for two qutrits. We present several generalizations of UPBs to arbitrary
high dimensions and multipartite systems. We present a sufficient condition for
sets of orthogonal product states to be distinguishable by separable
superoperators. We prove that bound entangled states cannot help increase the
distillable entanglement of a state beyond its regularized entanglement of
formation assisted by bound entanglement.
| [
{
"version": "v1",
"created": "Sun, 22 Aug 1999 17:00:55 GMT"
},
{
"version": "v2",
"created": "Fri, 12 Nov 1999 20:04:25 GMT"
},
{
"version": "v3",
"created": "Mon, 6 Nov 2000 15:51:51 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"DiVincenzo",
"David P.",
""
],
[
"Mor",
"Tal",
""
],
[
"Shor",
"Peter W.",
""
],
[
"Smolin",
"John A.",
""
],
[
"Terhal",
"Barbara M.",
""
]
] |
quant-ph/9908071 | Arnold Neumaier | Arnold Neumaier | On a realistic interpretation of quantum mechanics | 21 pages | null | null | null | quant-ph | null | The best mathematical arguments against a realistic interpretation of quantum
mechanics - that gives definite but partially unknown values to all observables
- are analysed and shown to be based on reasoning that is not compelling.
This opens the door for an interpretation that, while respecting the
indeterministic nature of quantum mechanics, allows to speak of definite values
for all observables at any time that are, however, only partially measurable.
The analysis also suggests new ways to test the foundations of quantum
theory.
| [
{
"version": "v1",
"created": "Sun, 22 Aug 1999 20:39:52 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Neumaier",
"Arnold",
""
]
] |
quant-ph/9908072 | Paul G. Kwiat | Peter D. D. Schwindt (1), Paul G. Kwiat (1), and Berthold-Georg
Englert (2) ((1) Physics Div., Los Alamos National Laboratory, (2)
Max-Planck-Institute fuer Quantenoptik) | Quantitative wave-particle duality and non-erasing quantum erasure | 6 pages, 4 figures. To appear in Phys. Rev. A | null | 10.1103/PhysRevA.60.4285 | LA-UR-98-5653 | quant-ph | null | The notion of wave-particle duality may be quantified by the inequality
V^2+K^2 <=1, relating interference fringe visibility V and path knowledge K.
With a single-photon interferometer in which polarization is used to label the
paths, we have investigated the relation for various situations, including
pure, mixed, and partially-mixed input states. A quantum eraser scheme has been
realized that recovers interference fringes even when no which-way information
is available to erase.
| [
{
"version": "v1",
"created": "Mon, 23 Aug 1999 23:28:07 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Schwindt",
"Peter D. D.",
""
],
[
"Kwiat",
"Paul G.",
""
],
[
"Englert",
"Berthold-Georg",
""
]
] |
quant-ph/9908073 | Charles H. Bennett | Charles H. Bennett, Sandu Popescu, Daniel Rohrlich, John A. Smolin,
and Ashish V. Thapliyal | Exact and Asymptotic Measures of Multipartite Pure State Entanglement | 13 pages including 3 PostScript figures. v3 has updated references
and discussion, to appear Phys. Rev. A | null | 10.1103/PhysRevA.63.012307 | null | quant-ph | null | In an effort to simplify the classification of pure entangled states of multi
(m) -partite quantum systems, we study exactly and asymptotically (in n)
reversible transformations among n'th tensor powers of such states (ie n copies
of the state shared among the same m parties) under local quantum operations
and classical communication (LOCC). With regard to exact transformations, we
show that two states whose 1-party entropies agree are either locally-unitarily
(LU) equivalent or else LOCC-incomparable. In particular we show that two
tripartite Greenberger-Horne-Zeilinger (GHZ) states are LOCC-incomparable to
three bipartite Einstein-Podolsky-Rosen (EPR) states symmetrically shared among
the three parties. Asymptotic transformations result in a simpler
classification than exact transformations. We show that m-partite pure states
having an m-way Schmidt decomposition are simply parameterizable, with the
partial entropy across any nontrivial partition representing the number of
standard ``Cat'' states (|0^m>+|1^m>) asymptotically interconvertible to the
state in question. For general m-partite states, partial entropies across
different partitions need not be equal, and since partial entropies are
conserved by asymptotically reversible LOCC operations, a multicomponent
entanglement measure is needed, with each scalar component representing a
different kind of entanglement, not asymptotically interconvertible to the
other kinds. In particular the m=4 Cat state is not isentropic to, and
therefore not asymptotically interconvertible to, any combination of bipartite
and tripartite states shared among the four parties. Thus, although the m=4 cat
state can be prepared from bipartite EPR states, the preparation process is
necessarily irreversible, and remains so even asymptotically.
| [
{
"version": "v1",
"created": "Tue, 24 Aug 1999 03:24:32 GMT"
},
{
"version": "v2",
"created": "Mon, 27 Dec 1999 20:20:05 GMT"
},
{
"version": "v3",
"created": "Sun, 25 Jun 2000 22:36:36 GMT"
}
] | 2021-05-26T00:00:00 | [
[
"Bennett",
"Charles H.",
""
],
[
"Popescu",
"Sandu",
""
],
[
"Rohrlich",
"Daniel",
""
],
[
"Smolin",
"John A.",
""
],
[
"Thapliyal",
"Ashish V.",
""
]
] |
quant-ph/9908074 | Yu Shi | Yu Shi | Remarks on Universal Quantum Computer | revtex, 14 pages, version appearing in Phys. Lett. A | Phys. Lett. A 293 (2002) 277 | 10.1016/S0375-9601(02)00015-4 | null | quant-ph | null | According to Deutsch, a universal quantum Turing machine (UQTM) is able to
perform, in repeating a fixed unitary transformation on the total system, an
arbitrary unitary transformation on an arbitrary data state, by including a
program as another part of the input state. We note that if such a UQTM really
exists, with the program state dependent on the data state, and if the
prescribed halting scheme is indeed valid, then there would be no entanglement
between the halt qubit and other qubits, as pointed out by Myers. If, however,
the program is required to be independent of the data, the concerned
entanglement appears, and is problematic no matter whether the halt qubit is
monitored or not. We also note that for a deterministic programmable quantum
gate array, as discussed by Nielson and Chuang, if the program is allowed to
depend on the data state, then its existence has not been ruled out. On the
other hand, if UQTM exists, it can be simulated by repeating the operation of a
fixed gate array. However, more importantly, we observe that it is actually
still open whether Deutsch's UQTM exists and whether a crucial concatenation
scheme, of which the halting scheme is a special case, is valid.
| [
{
"version": "v1",
"created": "Tue, 24 Aug 1999 10:00:29 GMT"
},
{
"version": "v2",
"created": "Sun, 5 Sep 1999 22:34:22 GMT"
},
{
"version": "v3",
"created": "Sat, 9 Oct 1999 13:15:25 GMT"
},
{
"version": "v4",
"created": "Tue, 8 Feb 2000 09:59:20 GMT"
},
{
"version": "v5",
"created": "Sun, 20 Jan 2002 23:02:20 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Shi",
"Yu",
""
]
] |
quant-ph/9908075 | Inge S. Helland | Inge S. Helland | Quantum Mechanics from Symmetry and Statistical Modelling | The paper has been withdrawn because it is outdated | null | null | null | quant-ph | null | A version of quantum theory is derived from a set of plausible assumptions
related to the following general setting: For a given system there is a set of
experiments that can be performed, and for each such experiment an ordinary
statistical model is defined. The parameters of the single experiments are
functions of a hyperparameter, which defines the state of the system. There is
a symmetry group acting on the hyperparameters, and for the induced action on
the parameters of the single experiment a simple consistency property is
assumed, called permissibility of the parametric function. The other
assumptions needed are rather weak. The derivation relies partly on quantum
logic, partly on a group representation of the hyperparameter group, where the
invariant spaces are shown to be in 1-1 correspondence with the equivalence
classes of permissible parametric functions. Planck's constant only plays a
role connected to generators of unitary group representations.
| [
{
"version": "v1",
"created": "Tue, 24 Aug 1999 11:22:17 GMT"
},
{
"version": "v2",
"created": "Sat, 7 Jul 2012 09:56:42 GMT"
}
] | 2012-07-10T00:00:00 | [
[
"Helland",
"Inge S.",
""
]
] |
quant-ph/9908076 | Inge S. Helland | Inge S. Helland | Quantum Theory from Symmetries in a General Statistical Parameter Space | The paper has been withdrawn because it is outdated | null | null | null | quant-ph | null | The aim of this paper is to show a connection between an extended theory of
statistical experiments on the one hand and the foundation of quantum theory on
the other hand. The main aspects of this extension are: One assumes a
hyperparameter space $\Phi$ common to several potential experiments, and a
basic symmetry group G associated with this space. The parameter \theta_{a} of
a single experiment, looked upon as a parametric function $\theta_{a}(\cdot)$
on $\Phi$, is said to be permissible if G induces in a natural way a new group
on the image space of the function. If this is not the case, it is arranged for
by changing from G to a subgroup $G_{a}$. The Haar measure of this subgroup
(confined to the spectrum; see below) is the prefered prior when the parameter
is unknown. It is assumed that the hyperparameter itself can never be
estimated, only a set of parametric functions. Model reduction is made by
restricting the space of complex `wave' functions, also regarded as functions
on $\Phi$, to an irreducible invariant subspace $\mathcal{M}$ under G. The
spectrum of a parametric function is defined from natural group-theoretical and
statistical considerations. We establish that a unique operator can be
associated with every parametric functions $\theta_{a}(\cdot)$, and essentially
all of the ordinary quantum theory formalism can be retrieved from these and a
few related assumptions. In particular the concept of spectrum is consistent.
The scope of the theory is illustrated on the one hand by the example of a spin
1/2 particle and a related EPR discussion, on the other hand by a simple
macroscopic example.
| [
{
"version": "v1",
"created": "Tue, 24 Aug 1999 11:30:59 GMT"
},
{
"version": "v2",
"created": "Sat, 7 Jul 2012 09:55:43 GMT"
}
] | 2012-07-10T00:00:00 | [
[
"Helland",
"Inge S.",
""
]
] |
quant-ph/9908077 | Richard A. Mould | Richard A. Mould | Quantum Consciousness | 12 pages, 5 figures | null | null | null | quant-ph | null | In a previous paper, the author proposed a quantum mechanical interaction
that would insure that the evolution of subjective states would parallel the
evolution of biological states, as required by von Neumann's theory of
measurement. The particular model for this interaction suggested an experiment
that the author has now performed wih negative results. A modified model is
outlined in this paper that preserves the desirable features of the original
model, and is consistent with the experimental results. This model will be more
difficult to verify. However, some strategies are suggested.
| [
{
"version": "v1",
"created": "Tue, 24 Aug 1999 18:07:09 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Mould",
"Richard A.",
""
]
] |
quant-ph/9908078 | Mike York | Michael J. York | Identity, Geometry, Permutation And The Spin-Statistics Theorem | This version includes revisions to the abstract, introduction and
other explanatory text. In particular, we give more attention to explaining
the short-comings of the conventional symmetrization postulate | null | null | null | quant-ph hep-th physics.ed-ph | null | We examine historic formulations of the spin-statistics theorem from a point
of view that distinguishes between the observable consequences and the
``symmetrization postulate''. In particular, we make a critical analysis of
concepts of particle identity, state distinguishability and permutation, and
particle ``labels''. We discuss how to construct unique state vectors and the
nature of the full state descriptions required for this -- in particular the
elimination of arbitrary $2\pi$ rotations on fermion spin quantization frames
and argue that the failure to do this renders the conventional symmetrization
postulate (and previous ``proofs'' of it) at best {\em incomplete}.
We discuss particle permutation in a general way for any pairs of particles,
whether identical or not, and make an essential distinction between exchange
and pure permutation. We prove a revised symmetrization postulate that allows
us to construct state vectors that are naturally symmetric under pure
permutation, {\em for any spin}. The significance of particle labels (which, in
the exchange operation, are not permuted along with other variables) is then
that they stand in for any asymmetry (order dependence) that is present in the
full state descriptions necessary for unique state vectors but not explicit in
the regular state variables. {\em The exchange operation is then the physical
transformation that reverses any asymmetry implicit in the labels}.
We point out a previously unremarked geometrical asymmetry between all pairs
of particles that is present whenever we choose a common frame of reference. We
compute the exchange phase for various state vectors using different spin
quantization frames, and prove the Pauli Exclusion Principle and its
generalization to arbitrary spin.
| [
{
"version": "v1",
"created": "Wed, 25 Aug 1999 02:57:44 GMT"
},
{
"version": "v2",
"created": "Mon, 15 Nov 1999 02:47:59 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"York",
"Michael J.",
""
]
] |
quant-ph/9908079 | Martin Bojowald | Martin Bojowald and Thomas Strobl | Group Theoretical Quantization and the Example of a Phase Space S^1 x
R^+ | 41 pages, LaTeX2e | J.Math.Phys. 41 (2000) 2537-2567 | 10.1063/1.533258 | PITHA 99/25, ESI 742 | quant-ph gr-qc hep-th | null | The group theoretical quantization scheme is reconsidered by means of
elementary systems. Already the quantization of a particle on a circle shows
that the standard procedure has to be supplemented by an additional condition
on the admissibility of group actions. A systematic strategy for finding
admissible group actions for particular subbundles of cotangent spaces is
developed, two-dimensional prototypes of which are T^*R^+ and S^1 x R^+
(interpreted as restrictions of T^*R and T^*S^1 to positive coordinate and
momentum, respectively). In this framework (and under an additional, natural
condition) an SO_+(1,2)-action on S^1 x R^+ results as the unique admissible
group action.
For symplectic manifolds which are (specific) parts of phase spaces with
known quantum theory a simple projection method of quantization is formulated.
For T^*R^+ and S^1 x R^+ equivalent results to those of more established (but
more involved) quantization schemes are obtained. The approach may be of
interest, e.g., in attempts to quantize gravity theories where demanding
nondegenerate metrics of a fixed signature imposes similar constraints.
| [
{
"version": "v1",
"created": "Fri, 27 Aug 1999 13:51:07 GMT"
},
{
"version": "v2",
"created": "Mon, 13 Dec 1999 13:33:43 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"Bojowald",
"Martin",
""
],
[
"Strobl",
"Thomas",
""
]
] |
quant-ph/9908080 | Thomas L. Clarke | Thomas L. Clarke | A Quantum NP Solver: NP in QP | Withdrawn by author because the Bk operators were non-unitary and | null | null | null | quant-ph | null | A attempt at a quantum algorithm for solving NP problems is presented. Now
withdrawn because some crucial operators were not unitary.
| [
{
"version": "v1",
"created": "Fri, 27 Aug 1999 17:56:19 GMT"
},
{
"version": "v2",
"created": "Mon, 30 Aug 1999 19:54:15 GMT"
}
] | 2012-01-19T00:00:00 | [
[
"Clarke",
"Thomas L.",
""
]
] |
quant-ph/9908081 | Andrew G. White | Andrew G. White (1), Daniel F. V. James (2), Philippe H. Eberhard (3)
and Paul G. Kwiat (1) ((1) Physics Division, P-23; (2) Theoretical Division,
T-4; Los Alamos National Laboratory. (3) Lawrence Berkeley Laboratory,
University of California.) | Non-maximally entangled states: production, characterization and
utilization | 4 pages, 4 figures. To appear in Phys. Rev. Lett | Physical Review Letters 83, no. 16, pp. 3103-3107 (1999) | 10.1103/PhysRevLett.83.3103 | LAUR 99-3196 | quant-ph | null | Using a spontaneous-downconversion photon source, we produce true
non-maximally entangled states, i.e., without the need for post-selection. The
degree and phase of entanglement are readily tunable, and are characterized
both by a standard analysis using coincidence minima, and by quantum state
tomography of the two-photon state. Using the latter, we experimentally
reconstruct the reduced density matrix for the polarization. Finally, we use
these states to measure the Hardy fraction, obtaining a result that is $122
\sigma$ from any local-realistic result.
| [
{
"version": "v1",
"created": "Fri, 27 Aug 1999 20:11:21 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"White",
"Andrew G.",
""
],
[
"James",
"Daniel F. V.",
""
],
[
"Eberhard",
"Philippe H.",
""
],
[
"Kwiat",
"Paul G.",
""
]
] |
quant-ph/9908082 | Steven J. van Enk | S.J. van Enk and H.J. Kimble | A single atom in free space as a quantum aperture | 4 pages ReVTeX and 3 eps figures | null | 10.1103/PhysRevA.61.051802 | null | quant-ph | null | We calculate exact 3-D solutions of Maxwell equations corresponding to
strongly focused light beams, and study their interaction with a single atom in
free space. We show how the naive picture of the atom as an absorber with a
size given by its radiative cross section $\sigma =3\lambda ^{2}/2\pi $ must be
modified. The implications of these results for quantum information processing
capabilities of trapped atoms are discussed.
| [
{
"version": "v1",
"created": "Fri, 27 Aug 1999 21:57:43 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"van Enk",
"S. J.",
""
],
[
"Kimble",
"H. J.",
""
]
] |
quant-ph/9908083 | Daniel S. Abrams | Daniel S. Abrams and Colin P. Williams | Fast quantum algorithms for numerical integrals and stochastic processes | null | null | null | null | quant-ph | null | We discuss quantum algorithms that calculate numerical integrals and
descriptive statistics of stochastic processes. With either of two distinct
approaches, one obtains an exponential speed increase in comparison to the
fastest known classical deterministic algorithms and a quadratic speed increase
in comparison to classical Monte Carlo (probabilistic) methods. We derive a
simpler and slightly faster version of Grover's mean algorithm, demonstrate how
to apply quantum counting to the problem, develop some variations of these
algorithms, and show how both (apparently quite different) approaches can be
understood from the same unified framework. Finally, we discuss how the
exponential speed increase appears to (but does not) violate results obtained
via the method of polynomials, from which it is known that a bounded-error
quantum algorithm for computing a total function can be only polynomially more
efficient than the fastest deterministic classical algorithm.
| [
{
"version": "v1",
"created": "Sat, 28 Aug 1999 00:40:19 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Abrams",
"Daniel S.",
""
],
[
"Williams",
"Colin P.",
""
]
] |
quant-ph/9908084 | H. Dieter Zeh | H. D. Zeh | The Problem of Conscious Observation in Quantum Mechanical Description | Published version: new abstract, minor changes, some new references.
14 pages, Latex | Found.Phys.Lett. 13 (2000) 221-233 | null | null | quant-ph gr-qc | null | Epistemological consequences of quantum nonlocality (entanglement) are
discussed under the assumption of a universally valid Schr\"odinger equation in
the absence of hidden variables. This leads inevitably to a {\it many-minds
interpretation}. The recent foundation of quasi-classical neural states in the
brain (based on environmental decoherence) permits in principle a formal
description of the whole chain of measurement interactions, including the {\it
behavior} of conscious observers, without introducing any intermediate
classical concepts (for macroscopic "pointer states") or "observables" (for
microscopic particle positions and the like) --- thus consistently formalizing
Einstein's {\it ganzer langer Weg} from the observed to the observer in quantum
mechanical terms.
| [
{
"version": "v1",
"created": "Sat, 28 Aug 1999 13:07:31 GMT"
},
{
"version": "v2",
"created": "Fri, 10 Mar 2000 15:17:34 GMT"
},
{
"version": "v3",
"created": "Mon, 5 Jun 2000 11:38:44 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Zeh",
"H. D.",
""
]
] |
quant-ph/9908085 | null | N.D. Hari Dass (IMSc, Chennai, India) | Cold Atoms For Testing Quantum Mechanics and Parity Violation In
Gravitation | Revtex, 8 pages | null | null | null | quant-ph | null | Techniques of Atom trapping and laser cooling have proved to be very
important tools in probing many aspects of fundamental physics. In this talk I
wish to present ideas on how they may used to settle certain issues in the
foundational aspects of quantum mechanics on the one hand and about some
quantum gravitational interactions of matter that violate parity and
time-reversal, on the other hand.
| [
{
"version": "v1",
"created": "Sat, 28 Aug 1999 16:53:19 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Dass",
"N. D. Hari",
"",
"IMSc, Chennai, India"
]
] |
quant-ph/9908086 | Michael Nielsen | M. A. Nielsen | Continuity bounds for entanglement | 5 pages, submitted to Physical Review A Brief Reports. Minor typo in
equation (25) corrected in resubmission | Physical Review A 61 (6): Art. No. 064301 (2000) | 10.1103/PhysRevA.61.064301 | null | quant-ph | null | This note quantifies the continuity properties of entanglement: how much does
entanglement vary if we change the entangled quantum state just a little? This
question is studied for the pure state entanglement of a bipartite system and
for the entanglement of formation of a bipartite system in a mixed state.
| [
{
"version": "v1",
"created": "Mon, 30 Aug 1999 01:19:57 GMT"
},
{
"version": "v2",
"created": "Fri, 3 Sep 1999 18:05:29 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Nielsen",
"M. A.",
""
]
] |
quant-ph/9908087 | Mario Encinosa | M. Encinosa and Ray N. O'Neal, Jr.(Florida A&M University) | Quantum particle constrained to a curved surface in the presence of a
vector potential | added author and changed two ambiguous phrases. submitted to Phys.
Rev. Lett | null | null | null | quant-ph | null | The Schrodinger equation for a charged particle constrained to a curved
surface in the presence of a vector potential is derived using the method of
forms. In the limit that the particle is brought infinitesimally close to the
surface, a term arises that couples the component of the vector potential
normal to the surface to the mean curvature of the surface.
| [
{
"version": "v1",
"created": "Mon, 30 Aug 1999 18:25:01 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Oct 1999 02:57:08 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"Encinosa",
"M.",
"",
"Florida A&M University"
],
[
"O'Neal,",
"Ray N.",
"Jr.",
"Florida A&M University"
]
] |
quant-ph/9908088 | Ricardo Moritz Cavalcanti | R. M. Cavalcanti | Comment on ``Validity of Feynman's prescription of disregarding the
Pauli principle in intermediate states'' | 1 page | Phys. Rev. A 62, 016101 (2000) | 10.1103/PhysRevA.62.016101 | null | quant-ph | null | In a recent paper Coutinho, Nogami and Tomio [Phys. Rev. A 59, 2624 (1999);
quant-ph/9812073] presented an example in which, they claim, Feynman's
prescription of disregarding the Pauli principle in intermediate states of
perturbation theory fails. We show that, contrary to their claim, Feynman's
prescription is consistent with the exact solution of their example.
| [
{
"version": "v1",
"created": "Tue, 31 Aug 1999 01:24:21 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Cavalcanti",
"R. M.",
""
]
] |
quant-ph/9908089 | Scutaru Horia | Horia Scutaru | A new measure of nonclassical distance | 14 pages, LaTeX, IOP journal preprint style, no figures, submitted to
Journal of Physics A: Math. Gen., September 1999 | null | null | FT-439-September 1999 | quant-ph | null | We propose a new measure of the nonclassical distance in the case of Gaussian
states. Let us consider two Gaussian states one of which is fixed and the other
runs through the set of Gaussian classical states. The maximum value of the
fidelity between these two states can be used as a nonclassical distance of the
fixed state to the set of classical states, in the same extent as the Hillery
measure. This measure increases when on the fixed state acts a Gaussian noise
map i.e. the selected state becomes closer to the classical states.
| [
{
"version": "v1",
"created": "Tue, 31 Aug 1999 08:29:08 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Scutaru",
"Horia",
""
]
] |
quant-ph/9908090 | Gavriel Segre | Gavriel Segre | Computability Superselection Rule and its physical explanation | cross-listing mistake | null | null | null | quant-ph | null | Paper erroneously re-submitted as duplicte. Readers should look at
math-ph/9909004.
| [
{
"version": "v1",
"created": "Tue, 31 Aug 1999 20:14:22 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Sep 1999 10:04:21 GMT"
},
{
"version": "v3",
"created": "Sat, 4 Sep 1999 19:56:06 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Segre",
"Gavriel",
""
]
] |
quant-ph/9909001 | Bonatsos Dennis | Dennis Bonatsos and C. Daskaloyannis | Quantum Algebraic Symmetries in Nuclei, Molecules and Atomic Clusters | 18 pages, LateX. Presented at the Balkan School on Nuclear Physics
(Istanbul, 1998) | Balkan Phys. Lett., Special Issue (1998) 145-162 | null | DEM-NT-98-02 | quant-ph | null | Various applications of quantum algebraic techniques in nuclear structure
physics and in molecular physics are briefly reviewed and a recent application
of these techniques to the structure of atomic clusters is discussed in more
detail.
| [
{
"version": "v1",
"created": "Wed, 1 Sep 1999 07:27:48 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bonatsos",
"Dennis",
""
],
[
"Daskaloyannis",
"C.",
""
]
] |
quant-ph/9909002 | Bonatsos Dennis | Dennis Bonatsos, N. Karoussos, P. P. Raychev, R. P. Roussev and P. A.
Terziev | The 3-Dimensional q-Deformed Harmonic Oscillator and Magic Numbers of
Alkali Metal Clusters | 13 pages, LaTeX | Chem. Phys. Lett. 302 (1999) 392-398 | 10.1016/S0009-2614(99)00199-2 | DEM-NT-99-03 | quant-ph | null | Magic numbers predicted by a 3-dimensional q-deformed harmonic oscillator
with Uq(3) > SOq(3) symmetry are compared to experimental data for alkali metal
clusters, as well as to theoretical predictions of jellium models, Woods--Saxon
and wine bottle potentials, and to the classification scheme using the 3n+l
pseudo quantum number. The 3-dimensional q-deformed harmonic oscillator
correctly predicts all experimentally observed magic numbers up to 1500 (which
is the expected limit of validity for theories based on the filling of
electronic shells), thus indicating that Uq(3), which is a nonlinear extension
of the U(3) symmetry of the spherical (3-dimensional isotropic) harmonic
oscillator, is a good candidate for being the symmetry of systems of alkali
metal clusters.
| [
{
"version": "v1",
"created": "Wed, 1 Sep 1999 07:28:03 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Bonatsos",
"Dennis",
""
],
[
"Karoussos",
"N.",
""
],
[
"Raychev",
"P. P.",
""
],
[
"Roussev",
"R. P.",
""
],
[
"Terziev",
"P. A.",
""
]
] |
quant-ph/9909003 | Miloslav Znojil | Miloslav Znojil | Exact solution for Morse oscillator in PT-symmetric quantum mechanics | 8 pages, submitted to Phys. Lett. A | Phys. Lett. A 264 (1999) 108-111 | 10.1016/S0375-9601(99)00805-1 | null | quant-ph | null | The recently proposed PT-symmetric quantum mechanics works with complex
potentials which possess, roughly speaking, a symmetric real part and an
anti-symmetric imaginary part. We propose and describe a new exactly solvable
model of this type. It is defined as a specific analytic continuation of the
shape-invariant potential of Morse. In contrast to the latter well-known
example, all the new spectrum proves real, discrete and bounded below. All its
three separate subsequences are quadratic in n.
| [
{
"version": "v1",
"created": "Wed, 1 Sep 1999 12:17:49 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Znojil",
"Miloslav",
""
]
] |
quant-ph/9909004 | Pinaki Roy | Geza Levai and Pinaki Roy | Conditionally Exactly Solvable Potentials and Supersymmetric
Transformations | 10 pages,Reference added | null | 10.1016/S0375-9601(99)00778-1 | null | quant-ph | null | A general procedure is presented to construct conditionally solvable (CES)
potentials using the techniques of supersymmetric quantum mechanics.The method
is illustrated with potentials related to the harmonic oscillator
problem.Besides recovering known results,new CES potentials are also obtained
within the framework of this general approach.The conditions under which this
method leads to CES potentials are also discussed.
| [
{
"version": "v1",
"created": "Wed, 1 Sep 1999 12:40:58 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Sep 1999 08:38:34 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Levai",
"Geza",
""
],
[
"Roy",
"Pinaki",
""
]
] |
quant-ph/9909005 | Anu Venugopalan | Anu Venugopalan | Pointer states via Decoherence in a Quantum Measurement | 9 pages, LaTex, communicated to Physical Review A | null | 10.1103/PhysRevA.61.012102 | null | quant-ph | null | We consider the interaction of a quantum system (spin-1/2) with a macroscopic
quantum apparatus (harmonic oscillator) which in turn is coupled to a bath of
harmonic oscillators. Exact solutions of the Markovian Master equation show
that the reduced density matrix of the system-apparatus combine decoheres to a
statistical mixture where up and down spins eventually correlate with pointer
states of the apparatus. For the zero temperature bath these pointer states
turn out to be coherent states of the harmonic oscillator for arbitrary initial
states of the apparatus. For a high temperature bath pointer states are
Gaussian distributions (generalized coherent states). For both cases, the
off-diagonal elements in spin-space decohere over a time scale which goes
inversely as the square of the "separation" between the "pointers". Our exact
results also demonstrate in an unambiguous way that the pointer states in this
measurement model emerge independent of the initial state of the apparatus.
| [
{
"version": "v1",
"created": "Wed, 1 Sep 1999 17:15:28 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Venugopalan",
"Anu",
""
]
] |
quant-ph/9909006 | Mark Hillery | Mark Hillery | Quantum cryptography with squeezed states | 15 pages, no figures | null | 10.1103/PhysRevA.61.022309 | null | quant-ph | null | A quantum key distribution scheme based on the use of displaced squeezed
vacuum states is presented. The states are squeezed in one of two field
quadrature components, and the value of the squeezed component is used to
encode a character from an alphabet. The uncertainty relation between
quadrature components prevents an eavesdropper from determining both with
enough precision to determine the character being sent. Losses degrade the
performance of this scheme, but it is possible to use phase-sensitive
amplifiers to boost the signal and partially compensate for their effect.
| [
{
"version": "v1",
"created": "Wed, 1 Sep 1999 21:38:32 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Hillery",
"Mark",
""
]
] |
quant-ph/9909007 | Simon Benjamin | S. C. Benjamin (Univ. of Oxford) | Schemes for Parallel Quantum Computation Without Local Control of Qubits | 12 pages + 3 figures. Several small corrections made | null | 10.1103/PhysRevA.61.020301 | null | quant-ph | null | Typical quantum computing schemes require transformations (gates) to be
targeted at specific elements (qubits). In many physical systems, direct
targeting is difficult to achieve; an alternative is to encode local gates into
globally applied transformations. Here we demonstrate the minimum physical
requirements for such an approach: a one-dimensional array composed of two
alternating 'types' of two-state system. Each system need be sensitive only to
the net state of its nearest neighbors, i.e. the number in state 1 minus the
number in state 2. Additionally, we show that all such arrays can perform quite
general parallel operations. A broad range of physical systems and interactions
are suitable: we highlight two potential implementations.
| [
{
"version": "v1",
"created": "Thu, 2 Sep 1999 18:35:27 GMT"
},
{
"version": "v2",
"created": "Sat, 18 Sep 1999 16:59:24 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Benjamin",
"S. C.",
"",
"Univ. of Oxford"
]
] |
quant-ph/9909008 | Alexander A. Kokin | K. A. Valiev and A. A. Kokin (Institute of Physics and Technology,
Russian Academy of Sciences) | Solid-state NMR quantum computer with individual access to qubits and
some its ensemble developments | LaTex 21 pages, 4 EPS figures; Figure 2 changed | null | null | null | quant-ph | null | Here we made an analysis of the principles of a semiconductor NMR quantum
computer and its developments. The known variant of an individual-access
computer (B. Kane) and alternative solid-state bulk-ensemble approach versions
allowing to avoid some difficulties in implementing the first variant are
considered.
| [
{
"version": "v1",
"created": "Thu, 2 Sep 1999 07:37:02 GMT"
},
{
"version": "v2",
"created": "Mon, 15 Nov 1999 16:31:29 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Valiev",
"K. A.",
"",
"Institute of Physics and Technology,\n Russian Academy of Sciences"
],
[
"Kokin",
"A. A.",
"",
"Institute of Physics and Technology,\n Russian Academy of Sciences"
]
] |
quant-ph/9909009 | W. A. Hofer | W. A. Hofer | On interference: the scalar problem | Six pages (RevTeX) and four figures (eps). For a full list of
available papers see http://info.tuwien.ac.at/cms/wh/ | null | null | MW-99-03 | quant-ph hep-th | null | Single-slit and two-slit interferometer measurements of electrons are
analyzed within the realistic model of particle propagation. In a step by step
procedure we show that all current models of interference are essentially
non-local and demonstrate that the treatment of the quantum theory of motion is
the simplest model for the scalar problem. In particular we give a novel
interpretation of the quantum potential Q, which should be regarded as a
non-classical and essentially statistical term describing the changes of the
quantum ensemble due to a change of the physical environment.
| [
{
"version": "v1",
"created": "Thu, 2 Sep 1999 09:35:14 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Hofer",
"W. A.",
""
]
] |
quant-ph/9909010 | Benni Reznik | Aharon Casher and Benni Reznik | Back-Reaction of Clocks and Limitations on Observability in Closed
Systems | 18 pages, 4 figures | Phys.Rev. A62 (2000) 042104 | 10.1103/PhysRevA.62.042104 | null | quant-ph gr-qc | null | Measurements are ordinarily described with respect to absolute "Newtonian"
time. In reality however, the switching-on of the measuring device at the
instance of the measurement requires a timing device. Hence the classical time
$t$ must be replaced by a suitable quantum time variable $\tau$ of a physical
clock. The main issue raised in this article is that while doing so, we can no
longer neglect the {\em back-reaction} due to the measurement on the clock.
This back-reaction yields a bound on the accuracy of the measurement. When this
bound is violated the result of a measurement is generally not an eigenvalue of
the observable, and furthermore, the state of the system after the measurement
is generally not a pure state. We argue that as a consequence, a sub-class of
observables in a closed system cannot be realized by a measurement.
| [
{
"version": "v1",
"created": "Thu, 2 Sep 1999 13:07:10 GMT"
}
] | 2009-10-31T00:00:00 | [
[
"Casher",
"Aharon",
""
],
[
"Reznik",
"Benni",
""
]
] |
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