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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
quant-ph/9707011 | Jinsoo Kim | Dong Pyo Chi and Jinsoo Kim | A Polynomial-Time Quantum Algorithm for Collision Problem | This paper was withdrawn because of gaps in this paper | null | null | null | quant-ph | null | In this paper, we give a quantum algorithm which solves collision problem in
an expected polynomial time. Especially, when the function is two-to-one, we
present a quantum algorithm which can find a collision with certainty in a
worst-case polynomial time. We also give a quantum algorithm which solves claw
problem with certainty in a worst-case polynomial time.
| [
{
"version": "v1",
"created": "Fri, 4 Jul 1997 07:54:55 GMT"
},
{
"version": "v2",
"created": "Sun, 6 Jul 1997 08:54:16 GMT"
},
{
"version": "v3",
"created": "Tue, 15 Jul 1997 08:12:52 GMT"
}
] | 2008-02-03T00:00:00 | [
[
"Chi",
"Dong Pyo",
""
],
[
"Kim",
"Jinsoo",
""
]
] |
quant-ph/9707012 | null | Stefano Mancini and Paolo Tombesi (Dipartimento di Matematica e
Fisica, Universita' di Camerino, Italy) | Measuring the Cyclotron State of a Trapped Electron | 8 pages, RevTex, 2 figures available from the authors, accepted by
Phys. Rev. A | Phys.Rev. A56 (1997) 3060 | 10.1103/PhysRevA.56.3060 | null | quant-ph | null | We propose the cyclotron state retrieval of an electron trapped in a Penning
trap by using different measurement schemes based on suitable modifications of
the applied electromagnetic fields and exploiting the axial degree of freedom
as a probe. A test for matter-antimatter symmetry of the quantum state is
proposed.
| [
{
"version": "v1",
"created": "Fri, 4 Jul 1997 12:44:39 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Mancini",
"Stefano",
"",
"Dipartimento di Matematica e\n Fisica, Universita' di Camerino, Italy"
],
[
"Tombesi",
"Paolo",
"",
"Dipartimento di Matematica e\n Fisica, Universita' di Camerino, Italy"
]
] |
quant-ph/9707013 | M. Czachor | Marek Czachor and Marcin Marciniak | Density matrix interpretation of solutions of Lie-Nambu equations | final version, to be published in Phys. Lett. A 239 No. 6, pp.
353-358 (16 March 1998) | null | 10.1016/S0375-9601(98)00047-4 | null | quant-ph | null | The spectrum of a density matrix $\rho(t)$ is conserved by a Lie-Nambu
dynamics if $\rho(t)$ is a self-adjoint and Hilbert-Schmidt solution of a
nonlinear triple-bracket equation. This generalizes to arbitrary separable
(positive- and indefinite-metric) Hilbert spaces the previous result which was
valid for finite-dimensional Hilbert spaces.
| [
{
"version": "v1",
"created": "Fri, 4 Jul 1997 13:24:13 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Feb 1998 17:58:51 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Czachor",
"Marek",
""
],
[
"Marciniak",
"Marcin",
""
]
] |
quant-ph/9707014 | Susana F. Huelga | S.F Huelga, C. Macchiavello, T. Pellizzari, A.K. Ekert, M. B. Plenio
and J.I. Cirac | On the Improvement of Frequency Stardards with Quantum Entanglement | 4 pages, 4 figures | Phys.Rev.Lett. 79 (1997) 3865 | 10.1103/PhysRevLett.79.3865 | null | quant-ph | null | The optimal precision of frequency measurements in the presence of
decoherence is discussed. We analyze different preparations of n two level
systems as well as different measurement procedures. We show that standard
Ramsey spectroscopy on uncorrelated atoms and optimal measurements on maximally
entangled states provide the same resolution. The best resolution is achieved
using partially entangled preparations with a high degree of symmetry.
| [
{
"version": "v1",
"created": "Fri, 4 Jul 1997 20:22:47 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Huelga",
"S. F",
""
],
[
"Macchiavello",
"C.",
""
],
[
"Pellizzari",
"T.",
""
],
[
"Ekert",
"A. K.",
""
],
[
"Plenio",
"M. B.",
""
],
[
"Cirac",
"J. I.",
""
]
] |
quant-ph/9707015 | Anton N. Artemyev | A.N. Artemyev, V.M. Shabaev, and V.A. Yerokhin | Vacuum polarization screening corrections to the ground state energy of
two-electron ions | 15 pages, LATeX, submited to Phys. Rev. A | null | 10.1103/PhysRevA.56.3529 | null | quant-ph | null | Vacuum polarization screening corrections to the ground state energy of
two-electron ions are calculated in the range $Z=20-100$. The calculations are
carried out for a finite nucleus charge distribution.
| [
{
"version": "v1",
"created": "Sun, 6 Jul 1997 19:50:04 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Artemyev",
"A. N.",
""
],
[
"Shabaev",
"V. M.",
""
],
[
"Yerokhin",
"V. A.",
""
]
] |
quant-ph/9707016 | Dirk Sondermann | Gerhard C. Hegerfeldt | Problems about Causality in Fermi's Two-Atom Model and Possible
Resolutions | 13 pages, Latex | null | null | null | quant-ph | null | In order to check finite propagation speed Fermi, in 1932, had considered two
atoms A and B separated by some distance R. At time t=0, A is in an excited
state, B in its ground state, and no photons are present. Fermi's idea was to
calculate the excitation probability of B. In a model-independent way and with
minimal assumptions - Hilbert space and positive energy only - it is proved,
not just for atoms but for any systems A and B, that the excitation probability
of B is nonzero immediately after t=0. Possible ways out to avoid a
contradiction to finite propagation speed are discussed. The notions of strong
and weak Einstein causality are introduced.
| [
{
"version": "v1",
"created": "Mon, 7 Jul 1997 09:11:59 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Hegerfeldt",
"Gerhard C.",
""
]
] |
quant-ph/9707017 | Vladimir Privman | V. Privman, I. D. Vagner and G. Kventsel | Quantum Computation in Quantum-Hall Systems | 12 pages in LaTeX + 1 PostScript figure | Phys.Lett.A239:141-146,1998 | 10.1016/S0375-9601(97)00974-2 | null | quant-ph cond-mat | null | We describe a quantum information processor (quantum computer) based on the
hyperfine interactions between the conduction electrons and nuclear spins
embedded in a two-dimensional electron system in the quantum-Hall regime.
Nuclear spins can be controlled individually by electromagnetic pulses. Their
interactions, which are of the spin-exchange type, can be possibly switched on
and off pair-wise dynamically, for nearest neighbors, by controlling
impurities. We also propose the way to feed in the initial data and explore
ideas for reading off the final results.
| [
{
"version": "v1",
"created": "Tue, 8 Jul 1997 13:59:23 GMT"
},
{
"version": "v2",
"created": "Wed, 7 Jan 1998 14:36:49 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Privman",
"V.",
""
],
[
"Vagner",
"I. D.",
""
],
[
"Kventsel",
"G.",
""
]
] |
quant-ph/9707018 | null | Stefano Mancini, Paolo Tombesi (Dipartimento di Matematica e Fisica,
Universita' di Camerino, Italy) and Vladimir I. Man'ko (Lebedev Physical
Institute, Moscow, Russia) | Beyond the Standard "Marginalizations" of Wigner Function | 12 pages, LaTex, no figures, to appear in Quantum and Semiclass. Opt | Quant.Semiclass.Opt. 9 (1997) 987 | 10.1088/1355-5111/9/6/011 | null | quant-ph | null | We discuss the problem of finding "marginal" distributions within different
tomographic approaches to quantum state measurement, and we establish
analytical connections among them.
| [
{
"version": "v1",
"created": "Tue, 8 Jul 1997 15:34:14 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Mancini",
"Stefano",
"",
"Dipartimento di Matematica e Fisica,\n Universita' di Camerino, Italy"
],
[
"Tombesi",
"Paolo",
"",
"Dipartimento di Matematica e Fisica,\n Universita' di Camerino, Italy"
],
[
"Man'ko",
"Vladimir I.",
"",
"Lebedev Physical\n Institute, Moscow, Russia"
]
] |
quant-ph/9707019 | Brif Constantin | C. Brif, A. Mann, M. Revzen (Technion, Haifa) | Generalized coherent states are unique Bell states of quantum systems
with Lie group symmetries | 4 pages, REVTeX, amssymb style. More information on
http://www.technion.ac.il/~brif/science.html | Phys.Rev. A57 (1998) 742 | 10.1103/PhysRevA.57.742 | null | quant-ph | null | We consider quantum systems, whose dynamical symmetry groups are semisimple
Lie groups, which can be split or decay into two subsystems of the same
symmetry. We prove that the only states of such a system that factorize upon
splitting are the generalized coherent states. Since Bell's inequality is never
violated by the direct product state, when the system prepared in the
generalized coherent state is split, no quantum correlations are created.
Therefore, the generalized coherent states are the unique Bell states, i.e.,
the pure quantum states preserving the fundamental classical property of
satisfying Bell's inequality upon splitting.
| [
{
"version": "v1",
"created": "Wed, 9 Jul 1997 13:49:44 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Brif",
"C.",
"",
"Technion, Haifa"
],
[
"Mann",
"A.",
"",
"Technion, Haifa"
],
[
"Revzen",
"M.",
"",
"Technion, Haifa"
]
] |
quant-ph/9707020 | Haiqing Wei | Haiqing Wei, Xin Xue and S.D. Morgera | Trapping Quantum Coherence in Local Energy Minima | Latex file | null | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Clusters of solid-state quantum devices have long-living metastable states of
local energy minima which may be used to store quantum information. The low to
vanishing rate of dissipation fulfils the prerequisite to maintain quantum
coherence. Then physical symmetrization of the devices could minimize the
couplings of the clusters to environmental degrees of freedom so to reduce the
rate of decoherence. Combined with various other error correction mechanisms
and methods, such designs and optimizations could render solid-state devices
useful for quantum information processing, which have the advantages of
flexibility in state manipulation and system scaling.
| [
{
"version": "v1",
"created": "Wed, 9 Jul 1997 16:42:04 GMT"
},
{
"version": "v2",
"created": "Sun, 12 May 2013 20:57:18 GMT"
}
] | 2013-05-14T00:00:00 | [
[
"Wei",
"Haiqing",
""
],
[
"Xue",
"Xin",
""
],
[
"Morgera",
"S. D.",
""
]
] |
quant-ph/9707021 | Alaxei Kitaev | A. Yu. Kitaev | Fault-tolerant quantum computation by anyons | 27 pages, Latex2e, uses amssymb.sty, 13 Postscript figures | Annals Phys. 303 (2003) 2-30 | 10.1016/S0003-4916(02)00018-0 | null | quant-ph cond-mat.mes-hall hep-th | null | A two-dimensional quantum system with anyonic excitations can be considered
as a quantum computer. Unitary transformations can be performed by moving the
excitations around each other. Measurements can be performed by joining
excitations in pairs and observing the result of fusion. Such computation is
fault-tolerant by its physical nature.
| [
{
"version": "v1",
"created": "Wed, 9 Jul 1997 18:28:27 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Kitaev",
"A. Yu.",
""
]
] |
quant-ph/9707022 | John T. Whelan | John T. Whelan | Propagator for a time-dependent harmonic oscillator | Paper withdrawn | null | null | null | quant-ph | null | This paper has been withdrawn, as the explicit form of the propagator can be
found in:
V.V.Dodonov, I.A.Malkin and V.I.Man'ko, J.Phys.A 8 (1975) L19
V.V.Dodonov, I.A.Malkin and V.I.Man'ko, Int.J.Theor.Phys. 14 (1975) 37, Sec.3
V.V.Dodonov, I.A.Malkin and V.I.Man'ko, Theor.Math.Phys. 24 (1975) 746, Sec.2
I am grateful to Professor Victor Dodonov for bringing this to my attention.
| [
{
"version": "v1",
"created": "Wed, 9 Jul 1997 22:13:07 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Aug 1997 03:00:14 GMT"
}
] | 2008-02-03T00:00:00 | [
[
"Whelan",
"John T.",
""
]
] |
quant-ph/9707023 | Nicolas Cerf | Nicolas J. Cerf (Caltech) | Entropic bounds on coding for noisy quantum channels | 20 pages RevTeX, 10 Postscript figures. Expanded Section II, added 1
figure, changed title. To appear in Phys. Rev. A (May 98) | Phys.Rev.A57:3330,1998 | 10.1103/PhysRevA.57.3330 | KRL MAP-215 | quant-ph | null | In analogy with its classical counterpart, a noisy quantum channel is
characterized by a loss, a quantity that depends on the channel input and the
quantum operation performed by the channel. The loss reflects the transmission
quality: if the loss is zero, quantum information can be perfectly transmitted
at a rate measured by the quantum source entropy. By using block coding based
on sequences of n entangled symbols, the average loss (defined as the overall
loss of the joint n-symbol channel divided by n, when n tends to infinity) can
be made lower than the loss for a single use of the channel. In this context,
we examine several upper bounds on the rate at which quantum information can be
transmitted reliably via a noisy channel, that is, with an asymptotically
vanishing average loss while the one-symbol loss of the channel is non-zero.
These bounds on the channel capacity rely on the entropic Singleton bound on
quantum error-correcting codes [Phys. Rev. A 56, 1721 (1997)]. Finally, we
analyze the Singleton bounds when the noisy quantum channel is supplemented
with a classical auxiliary channel.
| [
{
"version": "v1",
"created": "Thu, 10 Jul 1997 03:44:49 GMT"
},
{
"version": "v2",
"created": "Tue, 31 Mar 1998 02:20:46 GMT"
}
] | 2011-07-19T00:00:00 | [
[
"Cerf",
"Nicolas J.",
"",
"Caltech"
]
] |
quant-ph/9707024 | Werner Hofer | W. A. Hofer (TU-Wien) | Internal structures of electrons and photons and some consequences in
relativistic physics | 8 pages (ReVTeX, twocolumn) and 1 figure (eps). Talk given at the
International Conference 'Relativistic Physics and Some of its Applications',
June 25-28 in Athens, to appear in the proceedings. For a complete list of
available papers see http://info.tuwien.ac.at/cms/wh/ | null | null | MW-03-97 | quant-ph hep-th | null | The theoretical foundations of quantum mechanics and de Broglie-Bohm
mechanics are analyzed and it is shown that both theories employ a formal
approach to microphysics. By using a realistic approach it can be established
that the internal structures of particles comply with a wave-equation.
Including external potentials yields the Schrodinger equation, which, in this
context, is arbitrary due to internal energy components. The uncertainty
relations are an expression of this, fundamental, arbitrariness. Electrons and
photons can be described by an identical formalism, providing formulations
equivalent to the Maxwell equations. Electrostatic interactions justify the
initial assumption of electron-wave stability: the stability of electron waves
can be referred to vanishing intrinsic fields of interaction. Aspect's
experimental proof of non-locality is rejected, because these measurements
imply a violation of the uncertainty relations. The paper finally points out
some fundamental difficulties for a fully covariant formulation of quantum
electrodynamics, which seem to be related to the existing infinity problems in
this field.
| [
{
"version": "v1",
"created": "Thu, 10 Jul 1997 07:24:47 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Hofer",
"W. A.",
"",
"TU-Wien"
]
] |
quant-ph/9707025 | Eugeny Kochetov | E.A. Kochetov | Quasiclassical Path-Integral Approach to Quantum Mechanics Associated
with a Semisimple Lee Algebra | 20 pages, latex, no figures | null | null | null | quant-ph | null | A closed (in terms of classical data) expression for a transition amplitude
between two generalized coherent states associated with a semisimple Lee
algebra underlying the system is derived for large values of the representation
highest weight, which corresponds to the quasiclssical approximation.
Consideration is based upon a path-integral formalism adjusted to quantization
of symplectic coherent-state manifolds that appear as one-rank coadjoint
orbits.
| [
{
"version": "v1",
"created": "Thu, 10 Jul 1997 07:16:26 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Kochetov",
"E. A.",
""
]
] |
quant-ph/9707026 | Asher Peres | Asher Peres | Quantum Entanglement: Criteria and Collective Tests | 12 pages LaTeX, one figure. Proceedings of Nobel Symposium 104:
Modern Studies of Basic Quantum Concepts and Phenomena (Gimo, June 1997) to
appear in Physica Scripta (1998) | Phys.Scripta T76 (1998) 52 | 10.1238/Physica.Topical.076a00052 | null | quant-ph | null | The state of a quantum system, consisting of two distinct subsystems, is
called separable if it can be prepared by two distant experimenters who receive
instructions from a common source, via classical communication channels. A
necessary condition is derived and is shown to be more sensitive than Bell's
inequality for detecting quantum inseparability. Moreover, collective tests of
Bell's inequality (namely, tests that involve several composite systems
simultaneously) may sometimes lead to a violation of Bell's inequality, even if
the latter is satisfied when each composite system is tested separately.
| [
{
"version": "v1",
"created": "Fri, 11 Jul 1997 10:18:10 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Peres",
"Asher",
""
]
] |
quant-ph/9707027 | null | Corin Adlard, E. R Pike and Sarben Sarkar | On the Localization of One-Photon States | 7 pages, tex, no figures | Phys.Rev.Lett.79:1585-1587,1997 | 10.1103/PhysRevLett.79.1585 | null | quant-ph | null | Single photon states with arbitrarily fast asymptotic power-law fall-off of
energy density and photodetection rate are explicitly constructed. This goes
beyond the recently discovered tenth power-law of the Hellwarth-Nouchi photon
which itself superseded the long-standing seventh power-law of the Amrein
photon.
| [
{
"version": "v1",
"created": "Fri, 11 Jul 1997 14:29:08 GMT"
}
] | 2009-01-23T00:00:00 | [
[
"Adlard",
"Corin",
""
],
[
"Pike",
"E. R",
""
],
[
"Sarkar",
"Sarben",
""
]
] |
quant-ph/9707028 | Vladimir Buzek | Radoslav Derka, Vladimir Buzek, Artur Ekert | Universal Algorithm for Optimal Estimation of Quantum States from Finite
Ensembles | 4 pages, RevTeX, minor modifications to the text | Phys.Rev.Lett. 80 (1998) 1571-1575 | 10.1103/PhysRevLett.80.1571 | null | quant-ph | null | We present a universal algorithm for the optimal quantum state estimation of
an arbitrary finite dimensional system. The algorithm specifies a physically
realizable positive operator valued measurement (POVM) on a finite number of
identically prepared systems. We illustrate the general formalism by applying
it to different scenarios of the state estimation of N independent and
identically prepared two-level systems (qubits).
| [
{
"version": "v1",
"created": "Mon, 14 Jul 1997 20:37:06 GMT"
},
{
"version": "v2",
"created": "Wed, 16 Jul 1997 19:23:05 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Derka",
"Radoslav",
""
],
[
"Buzek",
"Vladimir",
""
],
[
"Ekert",
"Artur",
""
]
] |
quant-ph/9707029 | null | Ramandeep S. Johal | Angular Velocity Operator and Barnett-Pegg Formalism | 4 pages, Latex | null | null | null | quant-ph | null | We define a new operator within Barnett-Pegg formalism for phase angle. The
physical predictions for this operator correspond to those expected of an
angular velocity operator. Examples studied are particle on a circle with and
without magnetic field and quantum harmonic oscillator.
| [
{
"version": "v1",
"created": "Mon, 14 Jul 1997 04:22:11 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Johal",
"Ramandeep S.",
""
]
] |
quant-ph/9707030 | Guo Guangcan | Lu-Ming Duan and Guang-Can Guo (University of Science and Technology
of China) | Ghost interference and diffraction based on the beam splitter | 9 pages, 1 figures, Latex | null | null | null | quant-ph | null | A simple scheme is proposed for observing the ghost interference and
diffraction. The signal and the idler beams are produced by a beam splitter
with the incident light being in a thermal state. A slit is inserted into the
signal beam. We derive rigorously that interference-diffraction patterns can be
observed in the first-order correlation by scanning the probe in the idler
beam.
| [
{
"version": "v1",
"created": "Wed, 16 Jul 1997 01:32:51 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Duan",
"Lu-Ming",
"",
"University of Science and Technology\n of China"
],
[
"Guo",
"Guang-Can",
"",
"University of Science and Technology\n of China"
]
] |
quant-ph/9707031 | Cristopher Moore | Cristopher Moore and James P. Crutchfield | Quantum Automata and Quantum Grammars | 21 pages | null | null | null | quant-ph | null | To study quantum computation, it might be helpful to generalize structures
from language and automata theory to the quantum case. To that end, we propose
quantum versions of finite-state and push-down automata, and regular and
context-free grammars. We find analogs of several classical theorems, including
pumping lemmas, closure properties, rational and algebraic generating
functions, and Greibach normal form. We also show that there are quantum
context-free languages that are not context-free.
| [
{
"version": "v1",
"created": "Wed, 16 Jul 1997 20:29:24 GMT"
}
] | 2009-09-25T00:00:00 | [
[
"Moore",
"Cristopher",
""
],
[
"Crutchfield",
"James P.",
""
]
] |
quant-ph/9707032 | H. S. Sharatchandra | H.S.Sharatchandra | Coherent states for the anharmonic oscillator and classical phase space
trajectories | 8 pages, Latex | null | null | imsc-97-o7-28 | quant-ph | null | Unique set of coherent states for the anharmonic oscillator is obtained by
requiring i. under the quantum mechanical time evolution a coherent state
evolves into another, governed by trajectory in the classical phase space (of a
related hamiltonian); ii. the resolution of identity involves exactly the
classical phase space measure.The rules are invariant under unitary
transformations of the quantum theory and canonical transformations of the
classical theory. The states are almost, but not quite, minimal uncertainty
wave packets. The construction can be generalized to quantum versions of
integrable classical theories.
| [
{
"version": "v1",
"created": "Thu, 17 Jul 1997 04:09:02 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Sharatchandra",
"H. S.",
""
]
] |
quant-ph/9707033 | Richard Jozsa | Richard Jozsa | Quantum Algorithms and the Fourier Transform | 18 pages Latex. Submitted to Proceedings of Santa Barbara Conference
on Quantum Coherence and Decoherence | null | 10.1098/rspa.1998.0163 | null | quant-ph | null | The quantum algorithms of Deutsch, Simon and Shor are described in a way
which highlights their dependence on the Fourier transform. The general
construction of the Fourier transform on an Abelian group is outlined and this
provides a unified way of understanding the efficacy of these algorithms.
Finally we describe an efficient quantum factoring algorithm based on a general
formalism of Kitaev and contrast its structure to the ingredients of Shor's
algorithm.
| [
{
"version": "v1",
"created": "Thu, 17 Jul 1997 08:14:27 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Jozsa",
"Richard",
""
]
] |
quant-ph/9707034 | Richard Jozsa | Richard Jozsa | Entanglement and Quantum Computation | 11 pages Latex. Appearing in ``Geometric Issues in the Foundations of
Science'' ed. S. Huggett et. al. (O.U.P. 1997) | null | null | null | quant-ph | null | We argue that entanglement is the essential non-classical ingredient which
provides the computational speed-up in quantum algorithms as compared to
algorithms based on the processes of classical physics.
| [
{
"version": "v1",
"created": "Thu, 17 Jul 1997 08:15:30 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Jozsa",
"Richard",
""
]
] |
quant-ph/9707035 | Martin Plenio | V. Vedral and M.B. Plenio | Entanglement Measures and Purification Procedures | 40 pages, 2 figures, small changes, included references to Lieb and
Ruskai for the proof of strong subadditivity | Phys. Rev. A57:1619-1633,1998 | 10.1103/PhysRevA.57.1619 | null | quant-ph | null | We generalize previously proposed conditions each measure of entanglement has
to satisfy. We present a class of entanglement measures that satisfy these
conditions and show that the Quantum Relative Entropy and Bures Metric generate
two measures of this class. We calculate the measures of entanglement for a
number of mixed two spin 1/2 systems using the Quantum Relative Entropy, and
provide an efficient numerical method to obtain the measures of entanglement in
this case. In addition, we prove a number of properties of our entanglement
measure which have important physical implications. We briefly explain the
statistical basis of our measure of entanglement in the case of the Quantum
Relative Entropy. We then argue that our entanglement measure determines an
upper bound to the number of singlets that can be obtained by any purification
procedure and that distillable entanglement is in general smaller than the
entanglement of creation.
| [
{
"version": "v1",
"created": "Thu, 17 Jul 1997 09:28:44 GMT"
},
{
"version": "v2",
"created": "Sun, 7 Dec 1997 14:43:31 GMT"
}
] | 2011-07-19T00:00:00 | [
[
"Vedral",
"V.",
""
],
[
"Plenio",
"M. B.",
""
]
] |
quant-ph/9707036 | Judy Mack | Susumu Okubo | Lorentz-Invariant Hamiltonian and Riemann Hypothesis | 13 pages, TEX | J.Phys.A31:1049-1057,1998 | 10.1088/0305-4470/31/3/015 | UR-1502 | quant-ph | null | We have given some arguments that a two-dimensional Lorentz-invariant
Hamiltonian may be relevant to the Riemann hypothesis concerning zero points of
the Riemann zeta function. Some eigenfunction of the Hamiltonian corresponding
to infinite-dimensional representation of the Lorentz group have many
interesting properties. Especially, a relationship exists between the zero zeta
function condition and the absence of trivial representations in the wave
function.
| [
{
"version": "v1",
"created": "Thu, 17 Jul 1997 16:01:22 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Okubo",
"Susumu",
""
]
] |
quant-ph/9707037 | Manfred Leubner | C.W. Gardiner, P. Zoller, R.J. Ballagh and M.J. Davis | Kinetics of Bose-Einstein Condensation in a Trap | 9 pages, Revtex | Phys.Rev.Lett. 79 (1997) 1793-1796 | 10.1103/PhysRevLett.79.1793 | null | quant-ph | null | The formation process of a Bose-Einstein condensate in a trap is described
using a master equation based on quantum kinetic theory, which can be well
approximated by a description using only the condensate mode in interaction
with a thermalized bath of noncondensate atoms. A rate equation of the form n =
2W(n)[(1-exp((mu_n - mu)/kT))n + 1] is derived, in which the difference between
the condensate chemical potential mu_n and the bath chemical potential mu gives
the essential behavior. Solutions of this equation, in conjunction with the
theoretical description of the process of evaporative cooling, give a
characteristic latency period for condensate formation and appear to be
consistent with the observed behavior of both rubidium and sodium condensate
formation.
| [
{
"version": "v1",
"created": "Fri, 18 Jul 1997 12:15:14 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Gardiner",
"C. W.",
""
],
[
"Zoller",
"P.",
""
],
[
"Ballagh",
"R. J.",
""
],
[
"Davis",
"M. J.",
""
]
] |
quant-ph/9707038 | Hoi-Kwong Lo | Hoi-Kwong Lo (Hewlett-Packard Labs, Bristol, UK), and Sandu Popescu
(Isaac Newton Institute, Cambridge, UK and BRIMS, HP Labs, Bristol, UK) | Concentrating entanglement by local actions---beyond mean values | Substantially revised for clarity, Results unchanged, RevTex, 16
pages. Warning: The abstract posted on quant-ph is a truncated version which
satisfies the 24-line limit | null | null | null | quant-ph | null | Suppose two distant observers Alice and Bob share a pure bipartite quantum
state. By applying local operations and communicating with each other using a
classical channel, Alice and Bob can manipulate it into some other states.
Previous investigations of entanglement manipulations have been largely limited
to a small number of strategies and their average outcomes. Here we consider a
general entanglement manipulation strategy and go beyond the average property.
For a pure entangled state shared between two separated persons Alice and Bob,
we show that the mathematical interchange symmetry of the Schmidt decomposition
can be promoted into a physical symmetry between the actions of Alice and Bob.
Consequently, the most general (multi-step two-way-communications) strategy of
entanglement manipulation of a pure state is, in fact, equivalent to a strategy
involving only a single (generalized) measurement by Alice followed by one-way
communications of its result to Bob. We also prove that strategies with one-way
communications are generally more powerful than those without communications.
In summary, one-way communications is necessary and sufficient for the
entanglement manipulations of a pure bipartite state. The supremum probability
of obtaining a maximally entangled state (of any dimension) from an arbitrary
state is determined and a strategy for achieving this probability is
constructed explicitly. One important question is whether collective
manipulations in quantum mechanics can greatly enhance the probability of large
deviations from the average behavior. We answer this question in the negative
for a specific problem.
| [
{
"version": "v1",
"created": "Sun, 20 Jul 1997 13:08:50 GMT"
},
{
"version": "v2",
"created": "Thu, 8 Jul 1999 18:38:59 GMT"
}
] | 2008-02-03T00:00:00 | [
[
"Lo",
"Hoi-Kwong",
"",
"Hewlett-Packard Labs, Bristol, UK"
],
[
"Popescu",
"Sandu",
"",
"Isaac Newton Institute, Cambridge, UK and BRIMS, HP Labs, Bristol, UK"
]
] |
quant-ph/9707039 | null | S. De Martino, S. De Siena, F. Illuminati | Intrinsic chaoticity in stable classical systems and quantum
fluctuations | null | null | null | null | quant-ph chao-dyn nlin.CD | null | The paper has been withdrawn
| [
{
"version": "v1",
"created": "Mon, 21 Jul 1997 13:14:28 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Jun 1999 15:07:08 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"De Martino",
"S.",
""
],
[
"De Siena",
"S.",
""
],
[
"Illuminati",
"F.",
""
]
] |
quant-ph/9707040 | Tekin Dereli | T. Dereli(METU), A. Vercin(Ankara U.) | W(infty)-Covariance of the Weyl-Wigner-Groenewold-Moyal Quantization | 14 pages, Latex file. No figures. To apear in J. Math. Phys | J.Math.Phys. 38 (1997) 5515-5530 | 10.1063/1.532149 | null | quant-ph | null | The differential structure of operator bases used in various forms of the
Weyl-Wigner-Groenewold-Moyal (WWGM) quantization is analyzed and a
derivative-based approach, alternative to the conventional integral-based one
is developed. Thus the fundamental quantum relations follow in a simpler and
unified manner. An explicit formula for the ordered products of the
Heisenberg-Weyl algebra is obtained. The W(infty) -covariance of the
WWGM-quantization in its most general form is established. It is shown that the
group action of W(infty) that is realized in the classical phase space induces
on bases operators in the corresponding Hilbert space a similarity
transformation generated by the corresponding quantum W(infty) which provides a
projective representation of the former $W_{\infty}$. Explicit expressions for
the algebra generators in the classical phase space and in the Hilbert space
are given. It is made manifest that this W(infty)-covariance of the
WWGM-quantization is a genuine property of the operator bases.
| [
{
"version": "v1",
"created": "Thu, 21 Jul 1994 12:28:06 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Dereli",
"T.",
"",
"METU"
],
[
"Vercin",
"A.",
"",
"Ankara U."
]
] |
quant-ph/9707041 | Anna Sanpera | Anna Sanpera, Rolf Tarrach and Guifre Vidal | Quantum separability, time reversal and canonical decompositions | 9 pages, Revtex, no figures | null | null | null | quant-ph | null | We propose an interpretation of quantum separability based on a physical
principle: local time reversal. It immediately leads to a simple
characterization of separable quantum states that reproduces results known to
hold for binary composite systems and which thereby is complete for low
dimensions. We then describe a constructive algorithm for finding the canonical
decomposition of separable and non separable mixed states of dimensions 2x2 and
2x3.
| [
{
"version": "v1",
"created": "Mon, 21 Jul 1997 13:26:59 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Sanpera",
"Anna",
""
],
[
"Tarrach",
"Rolf",
""
],
[
"Vidal",
"Guifre",
""
]
] |
quant-ph/9707042 | Wolfgang Tittel | W. Tittel, J. Brendel, B. Gisin, T. Herzog, H. Zbinden, and N. Gisin | Experimental demonstration of quantum correlations over more than 10 km | 5 pages, REVTeX, 3 postscript figures included | Phys. Rev. A 57, 3229 (1998) | 10.1103/PhysRevA.57.3229 | null | quant-ph | null | Energy and time entangled photons at a wavelength of 1310 nm are produced by
parametric downconversion in a KNbO3 crystal and are sent into all-fiber
interferometers using a telecom fiber network. The two interferometers of this
Franson-type test of the Bell-inequality are located 10.9 km apart from one
another. Two-photon fringe visibilities of up to 81.6 % are obtained. These
strong nonlocal correlations support the nonlocal predictions of quantum
mechanics and provide evidence that entanglement between photons can be
maintained over long distances.
| [
{
"version": "v1",
"created": "Tue, 22 Jul 1997 13:11:14 GMT"
},
{
"version": "v2",
"created": "Thu, 11 Dec 1997 08:40:41 GMT"
},
{
"version": "v3",
"created": "Fri, 12 Jun 1998 13:28:52 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Tittel",
"W.",
""
],
[
"Brendel",
"J.",
""
],
[
"Gisin",
"B.",
""
],
[
"Herzog",
"T.",
""
],
[
"Zbinden",
"H.",
""
],
[
"Gisin",
"N.",
""
]
] |
quant-ph/9707043 | Anna Sanpera | Maciej Lewenstein and Anna Sanpera | Separability and entanglement of composite quantum systems | 4 pages Latex, 1 figure | Phys.Rev.Lett. 80 (1998) 2261-2264 | 10.1103/PhysRevLett.80.2261 | null | quant-ph | null | We provide a constructive algorithm to find the best separable approximation
to an arbitrary density matrix of a composite quantum system of finite
dimensions. The method leads to a condition of separability and to a measure of
entanglement.
| [
{
"version": "v1",
"created": "Tue, 22 Jul 1997 13:21:55 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Lewenstein",
"Maciej",
""
],
[
"Sanpera",
"Anna",
""
]
] |
quant-ph/9707044 | Haret Rosu | H.C. Rosu, J.L. Romero | Ermakov approach for the one-dimensional Helmholtz Hamiltonian | 6 pages, LaTex | Nuovo Cim. B114 (1999) 569-574 | null | null | quant-ph | null | For the one-dimensional Helmholtz equation we write the corresponding
time-dependent Helmholtz Hamiltonian in order to study it as an Ermakov problem
and derive geometrical angles and phases in this context
| [
{
"version": "v1",
"created": "Tue, 22 Jul 1997 22:41:34 GMT"
},
{
"version": "v2",
"created": "Sun, 30 Nov 1997 22:42:43 GMT"
},
{
"version": "v3",
"created": "Sat, 26 Jun 1999 16:55:13 GMT"
}
] | 2008-02-03T00:00:00 | [
[
"Rosu",
"H. C.",
""
],
[
"Romero",
"J. L.",
""
]
] |
quant-ph/9707045 | null | Stefano Mancini and Paolo Tombesi (Dipartimento di Matematica e
Fisica, Universita' di Camerino, Italy) | Macroscopic Coherence for a Trapped Electron | 6 pages, RevTex, accepted by Phys. Rev. A | Phys.Rev.A56:1679,1997 | 10.1103/PhysRevA.56.R1679 | null | quant-ph | null | We investigate the possibility of generating quantum macroscopic coherence
phenomena by means of relativistic effects on a trapped electron.
| [
{
"version": "v1",
"created": "Wed, 23 Jul 1997 09:52:17 GMT"
}
] | 2011-08-04T00:00:00 | [
[
"Mancini",
"Stefano",
"",
"Dipartimento di Matematica e\n Fisica, Universita' di Camerino, Italy"
],
[
"Tombesi",
"Paolo",
"",
"Dipartimento di Matematica e\n Fisica, Universita' di Camerino, Italy"
]
] |
quant-ph/9707046 | Holger Hofmann | Holger F. Hofmann, Guenter Mahler, and Ortwin Hess | Quantum control of atomic systems by time resolved homodyne detection
and feedback | 12 pages RevTex and 7 figures, to be published in Phys. Rev. A, final
version | Phys.Rev.A 57, 4877 (1998) | 10.1103/PhysRevA.57.4877 | null | quant-ph physics.atom-ph physics.optics | null | We investigate the possibilities of preserving and manipulating the coherence
of atomic two-level systems by ideal projective homodyne detection and
feedback. For this purpose, the photon emission process is described on time
scales much shorter than the lifetime of the excited state using a model based
on Wigner-Weisskopf theory. The backaction of this emission process is
analytically described as a quantum diffusion of the Bloch vector. It is shown
that the evolution of the atomic wavefunction can be controlled completely
using the results of homodyne detection. This allows the stabilization of a
known quantum state or the creation of coherent states by a feedback mechanism.
However, the feedback mechanism can never compensate the dissipative effects of
quantum fluctuations even though the coherent state of the system is known at
all times.
| [
{
"version": "v1",
"created": "Wed, 23 Jul 1997 14:06:29 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Apr 1998 11:13:34 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Hofmann",
"Holger F.",
""
],
[
"Mahler",
"Guenter",
""
],
[
"Hess",
"Ortwin",
""
]
] |
quant-ph/9707047 | Asher Peres | Asher Peres | Quantum Disentanglement and Computation | 10 pages LaTeX, to appear in special issue of Superlattices and
Microstructures (1998), in honor of the 70th birthday of Rolf Landauer | Superlattices Microstruct. 23 (1998) 373 | 10.1006/spmi.1997.0518 | null | quant-ph | null | Entanglement is essential for quantum computation. However, disentanglement
is also necessary. It can be achieved without the need of classical operations
(measurements). Two examples are analyzed: the discrete Fourier transform and
error correcting codes.
| [
{
"version": "v1",
"created": "Thu, 24 Jul 1997 08:04:19 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Peres",
"Asher",
""
]
] |
quant-ph/9707048 | Massimo Blasone | M. Blasone, Y.N. Srivastava, G. Vitiello, A. Widom | Phase Coherence in Quantum Brownian Motion | 12 pages, LaTeX, 2 Figures | Annals Phys. 267 (1998) 61-74 | 10.1006/aphy.1998.5811 | null | quant-ph hep-th | null | The quantum theory of Brownian motion is discussed in the Schwinger version
wherein the notion of a coordinate moving forward in time $x(t)$ is replaced by
two coordinates, $x_+(t)$ moving forward in time and $x_-(t)$ moving backward
in time. The role of the doubling of the degrees of freedom is illustrated for
the case of electron beam two slit diffraction experiments. Interference is
computed with and without dissipation (described by a thermal bath). The notion
of a dissipative interference phase, closely analogous to the Aharonov-Bohm
magnetic field induced phase, is explored.
| [
{
"version": "v1",
"created": "Thu, 24 Jul 1997 10:13:23 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Blasone",
"M.",
""
],
[
"Srivastava",
"Y. N.",
""
],
[
"Vitiello",
"G.",
""
],
[
"Widom",
"A.",
""
]
] |
quant-ph/9707049 | Juan Pablo Paz | Juan Pablo Paz and Wojciech Hubert Zurek | Continuous Error Correction | 10 pages with 2 figures. Submitted to Proc. Roy. Soc. Lond. A | null | null | null | quant-ph | null | We propose a new approach to study the evolution of a quantum state that is
encoded in a system which is continuously subject to the operations required to
implement a quantum error correcting code. In the limit of continuous error
correction we introduce a Markovian master equation that includes the effects
of: a) Hamiltonian evolution, b) errors caused by the interaction with an
environment and c) error-correcting operations. The master equation is formally
presented for all stabilizer codes and its solution is analyzed for the
simplest such code.
| [
{
"version": "v1",
"created": "Fri, 25 Jul 1997 01:45:40 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Paz",
"Juan Pablo",
""
],
[
"Zurek",
"Wojciech Hubert",
""
]
] |
quant-ph/9707050 | Yury A. Cuperin | L.A.Dmitrieva, Yu.A.Kuperin, Yu.B.Melnikov | One-Dimensional Discrete Stark Hamiltonian and Resonance Scattering by
Impurities | 20 pages, Latex, no figures | null | 10.1088/0305-4470/30/9/019 | null | quant-ph | null | A one-dimensional discrete Stark Hamiltonian with a continuous electric field
is constructed by extension theory methods. In absence of the impurities the
model is proved to be exactly solvable, the spectrum is shown to be simple,
continuous, filling the real axis; the eigenfunctions, the resolvent and the
spectral measure are constructed explicitly. For this (unperturbed) system the
resonance spectrum is shown to be empty. The model considering impurity in a
single node is also constructed using the operator extension theory methods.
The spectral analysis is performed and the dispersion equation for the
resolvent singularities is obtained. The resonance spectrum is shown to contain
infinite discrete set of resonances. One-to-one correspondence of the
constructed Hamiltonian to some Lee-Friedrichs model is established.
| [
{
"version": "v1",
"created": "Thu, 27 Mar 1997 03:03:31 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Dmitrieva",
"L. A.",
""
],
[
"Kuperin",
"Yu. A.",
""
],
[
"Melnikov",
"Yu. B.",
""
]
] |
quant-ph/9707051 | Edward R. Floyd | Edward R. Floyd | Where and why the generalized Hamilton-Jacobi representation describes
microstates of the Schr\"odinger wave function | 6 pages, LaTeX 2.09 | Found.Phys.Lett. 9 (1996) 489-497 | null | null | quant-ph | null | A generalized Hamilton-Jacobi representation describes microstates of the
Schr\"odinger wave function for bound states. At the very points that boundary
values are applied to the bound state Schr\"odinger wave function, the
generalized Hamilton-Jacobi equation for quantum mechanics exhibits a nodal
singularity. For initial value problems, the two representations are
equivalent.
| [
{
"version": "v1",
"created": "Sat, 26 Jul 1997 14:56:32 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Floyd",
"Edward R.",
""
]
] |
quant-ph/9707052 | Madjid Aboolhassani | M. Abolhasani & M. Golshani | Born's principle and Action-Reaction problem | Latex file, 9 pages, some extra explanation have been omitted | null | null | IPM-97-202 | quant-ph | null | In a recent paper, A.Valentini tried to obtain Born's principle as a result
of a subquantum heat death, using classical H-theorem and the definition of a
proper quantum H-theorem within the framwork of Bohm's theory. In this paper,
we shall show the possibility of solving the problem of action-reaction
asymmetry present in Bohm's theory by modifying Valentini's procedure. However,
we get his main result too.
| [
{
"version": "v1",
"created": "Mon, 28 Jul 1997 12:38:57 GMT"
},
{
"version": "v2",
"created": "Mon, 12 Jan 1998 06:36:42 GMT"
}
] | 2008-02-03T00:00:00 | [
[
"Abolhasani",
"M.",
""
],
[
"Golshani",
"M.",
""
]
] |
quant-ph/9707053 | Jim McElwaine | Jim McElwaine | Approximate Consistency and Prediction Algorithms in Quantum Mechanics | 176 pages, 11 figures, 19 programs | Ph.D. Thesis, Cambridge (1996) | null | null | quant-ph | null | This dissertation investigates questions arising in the consistent histories
formulation of the quantum mechanics of closed systems. Various criteria for
approximate consistency are analysed. The connection between the
Dowker-Halliwell criterion and sphere packing problems is shown and used to
prove several new bounds on the violation of probability sum rules. The quantum
Zeno effect is also analysed within the consistent histories formalism and used
to demonstrate some of the difficulties involved in discussing approximate
consistency. The complications associated with null histories and infinite sets
are briefly discussed.
The possibility of using the properties of the Schmidt decomposition to
define an algorithm which selects a single, physically natural, consistent set
for pure initial density matrices is investigated. The problems that arise are
explained, and different possible algorithms discussed. Their properties are
analysed with the aid of simple models. A set of computer programs is described
which apply the algorithms to more complicated examples.
Another algorithm is proposed that selects the consistent set (formed using
Schmidt projections) with the highest Shannon information. This is applied to a
simple model and shown to produce physically sensible histories. The theory is
capable of unconditional probabilistic prediction for closed quantum systems,
and is strong enough to be falsifiable. Ideas on applying the theory to more
complicated examples are discussed.
| [
{
"version": "v1",
"created": "Tue, 29 Jul 1997 07:05:00 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"McElwaine",
"Jim",
""
]
] |
quant-ph/9707054 | Dmitri S. Kilin | D. Kilin and M. Schreiber | Decoherence for phase-sensitive relaxation | The correspondent poster was presented on DPC-97. The poster is
available at http://www.tu-chemnitz.de/~kilin/publist.html | null | null | null | quant-ph | null | The linear and quadratic interactions of an impurity vibrational mode coupled
with a heat bath are investigated with a non-Markovian equation of motion for
the reduced density matrix valid for the initial, intermediate and kinetic
stages of relaxation. The evolution of the superpositional states is considered
for all cases.
| [
{
"version": "v1",
"created": "Tue, 29 Jul 1997 21:02:10 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Mar 1999 10:40:02 GMT"
}
] | 2008-02-03T00:00:00 | [
[
"Kilin",
"D.",
""
],
[
"Schreiber",
"M.",
""
]
] |
quant-ph/9707055 | Peter Nattermann | W. Luecke and P. Nattermann | Nonlinear Quantum Mechanics and Locality | 10 pages, no figures, also available on
http://www.pt.tu-clausthal.de/preprints/asi-tpa/012-97.html | null | null | ASI-TPA/12/97 | quant-ph | null | It is shown that, in order to avoid unacceptable nonlocal effects, the free
parameters of the general Doebner-Goldin equation have to be chosen such that
this nonlinear Schr\"odinger equation becomes Galilean covariant.
| [
{
"version": "v1",
"created": "Wed, 30 Jul 1997 07:49:46 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Luecke",
"W.",
""
],
[
"Nattermann",
"P.",
""
]
] |
quant-ph/9707056 | Schneider | Jean Schneider (CNRS- Observatoire de Paris) | Time and the Mind/Body Problem: A Quantum Perspective | 17 Pages, Latex, no figures. Invited conference at the `Psycho-
analysis and Physics' Meeting, New York, December 1996. In press in American
Imago. Also at http://www.obspm.fr/departement/darc/schneider/qm.html | null | null | null | quant-ph | null | The Semiotic Interpretation (SI) of QM pushes further the Von Neumann point
of view that `experience only makes statements of this type: an observer has
made a certain observation; and never any like this: a physical quantity has a
certain value.' The supposition that the observables of a system `possess'
objective values is purely idealistic. According to the SI view, the state-
vector collapse cannot result from the Schroedinger evolution of a system (even
with its environment), but only from the empirical production of a mathematical
symbol, irreducible to the quantum level. The production of a symbol always
takes some time. Thus the state-vector collapse cannot be instantaneous
(Schneider 1994), a specific prediction of the present model.
From this interpretation of Quantum Mechanics, the appearances of the body
are the result of state-vector collapses of several types, i.e. the production
of different kinds of symbols. In fact the universe of symbols is very rich: a
symbol can have a conceptual `value' (like in physics and then give rise to a
measurement), or other qualitative values (like in many human behaviors). In
the latter case, the Semiotic Interpretation of QM gives a way to understand
how a mental representation can modify the state of the body.
| [
{
"version": "v1",
"created": "Wed, 30 Jul 1997 09:42:06 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Schneider",
"Jean",
"",
"CNRS- Observatoire de Paris"
]
] |
quant-ph/9707057 | null | T. Csorgo and J. Zimanyi | Brooding over Pion Lasers | LaTeX, 6 pages, no figures . Talk given by T. Csorgo at the Fifth
International Conference on Squeezed States and Uncertainty Relations,
Balatonfured, Hungary, May 27-31, 1997. (NASA Conference Publication Series,
ed. J. Janszky, Y.S. Kim and V. I. Man'ko, to appear) | Proc. FICSSUR'97, NASA/CP-1998-206855 p. 573 | null | null | quant-ph | null | Brooding over pions, wave packets and Bose-Einstein correlations, we present
a recently obtained analytical solution to a pion laser model, which may
describe the final state of pions in high energy heavy ion collisions.
| [
{
"version": "v1",
"created": "Thu, 31 Jul 1997 11:43:12 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Csorgo",
"T.",
""
],
[
"Zimanyi",
"J.",
""
]
] |
quant-ph/9707058 | S. A. Gardiner | S. A. Gardiner, J. I. Cirac, and P. Zoller | Quantum chaos in an ion trap: the delta-kicked harmonic oscillator | 4 pages RevTeX, 4 eps figures, in TAR file. Minor corrections,
revised refernces | Phys.Rev.Lett.79:4790-4793,1997; Erratum-ibid.80:2968,1998 | 10.1103/PhysRevLett.79.4790 | null | quant-ph | null | We propose an experimental configuration, within an ion trap, by which a
quantum mechanical delta-kicked harmonic oscillator could be realized, and
investigated. We show how to directly measure the sensitivity of the ion motion
to small variations in the external parameters.
| [
{
"version": "v1",
"created": "Thu, 31 Jul 1997 11:53:33 GMT"
},
{
"version": "v2",
"created": "Thu, 18 Dec 1997 18:40:57 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Gardiner",
"S. A.",
""
],
[
"Cirac",
"J. I.",
""
],
[
"Zoller",
"P.",
""
]
] |
quant-ph/9707059 | Andreas Fring | A. Fring, V. Kostrykin and R. Schrader | Ionization Probabilities through ultra-intense Fields in the extreme
Limit | 16 pages LateX, 2 figures | J.Phys.A30:8599-8610,1997 | 10.1088/0305-4470/30/24/020 | SfB-288 Preprint No.224, Berlin | quant-ph physics.atom-ph | null | We continue our investigation concerning the question of whether atomic bound
states begin to stabilize in the ultra-intense field limit. The pulses
considered are essentially arbitrary, but we distinguish between three
situations. First the total classical momentum transfer is non-vanishing,
second not both the total classical momentum transfer and the total classical
displacement are vanishing together with the requirement that the potential has
a finite number of bound states and third both the total classical momentum
transfer and the total classical displacement are vanishing. For the first two
cases we rigorously prove, that the ionization probability tends to one when
the amplitude of the pulse tends to infinity and the pulse shape remains fixed.
In the third case the limit is strictly smaller than one. This case is also
related to the high frequency limit considered by Gavrila et al.
| [
{
"version": "v1",
"created": "Thu, 31 Jul 1997 15:17:15 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Fring",
"A.",
""
],
[
"Kostrykin",
"V.",
""
],
[
"Schrader",
"R.",
""
]
] |
quant-ph/9707060 | Lev Vaidman | Lev Vaidman and Ori Belkind | Strict Bounds on Franson Inequality | 3 pages, LaTeX | null | 10.1103/PhysRevA.57.1583 | null | quant-ph | null | An inequality, recently proposed by Franson [Phys. Rev. A 54, 3808 (1996)] is
analyzed and improved. The inequality connects the change of the expectation
value of an observable with the uncertainty of this observable. A strict bound
on the ratio between these two quantities is obtained.
| [
{
"version": "v1",
"created": "Thu, 31 Jul 1997 17:46:44 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Vaidman",
"Lev",
""
],
[
"Belkind",
"Ori",
""
]
] |
quant-ph/9708001 | Karl-Peter Marzlin | Karl-Peter Marzlin and J"urgen Audretsch | Collapse and revival of ultracold atoms in a microwave cavity and of
photons in parametric down-conversion | 5 pages, RevTeX, 3 figures | Phys.Rev. A57 (1998) 1333 | 10.1103/PhysRevA.57.1333 | null | quant-ph | null | We present a new theoretical method to study a trapped gas of bosonic
two-level atoms interacting with a single mode of a microwave cavity. This
interaction is described by a trilinear Hamiltonian which is formally
completely equivalent to the one describing parametric down-conversion in
quantum optics. A system of differential equations describing the evolution,
including the long-time behaviour, of not only the mean value but also the
variance of the number of excited atoms is derived and solved analytically. For
different initial states the mean number of excited atoms exhibits periodically
reappearing dips, with an accompanying peak in the variance, or fractional
collapses and revivals. Closed expressions for the period and the revival time
are obtained.
| [
{
"version": "v1",
"created": "Fri, 1 Aug 1997 01:16:21 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Marzlin",
"Karl-Peter",
""
],
[
"Audretsch",
"J\"urgen",
""
]
] |
quant-ph/9708002 | Kurt Jacobs | S. Bose, K. Jacobs and P. L. Knight | Preparation of Nonclassical States in Cavities with a Moving Mirror | 13 pages, 18 eps figures included in tar file, revtex, multicol, to
appear in Phys. Rev. A | Phys.Rev.A56:4175-4186,1997 | 10.1103/PhysRevA.56.4175 | null | quant-ph | null | We describe how a quantum system composed of a cavity field interacting with
a movable mirror can be utilized to generate a large variety of nonclassical
states of both the cavity field and the mirror. First we consider state
preparation of the cavity field. The system dynamics will prepare a single mode
of the cavity field in a multicomponent Schr\"{o}dinger cat state, in a similar
manner to that in a Kerr medium. In addition, when two or more cavity modes
interact with the mirror, they may be prepared in an entangled state which may
be regarded as a multimode generalisation of even and odd coherent states. We
show also that near-number states of a single mode may be prepared by
performing a measurement of the position of the mirror. Secondly we consider
state preparation of the mirror, and show that this macroscopic object may be
placed in a Scr\"{o}dinger cat state by a quadrature measurement of the light
field. In addition we examine the effect of the damping of the motion of the
mirror on the field states inside the cavity, and compare this with the effect
of cavity field damping.
| [
{
"version": "v1",
"created": "Fri, 1 Aug 1997 14:40:09 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Bose",
"S.",
""
],
[
"Jacobs",
"K.",
""
],
[
"Knight",
"P. L.",
""
]
] |
quant-ph/9708003 | Dr N. Mavromatos | N.E. Mavromatos and D.V. Nanopoulos | On Quantum Mechanical Aspects of Microtubules | 26 pages LATEX (minor typos corrected no effect on conclusions) | null | 10.1142/S0217979298000326 | ACT-12/97, CTP-TAMU-33/97, OUTP-97-37P | quant-ph cond-mat | null | We discuss possible quantum mechanical aspects of MicroTubules (MT), based on
recent developments in quantum physics.We focus on potential mechanisms for
`energy-loss-free' transport along the microtubules, which could be considered
as realizations of Fr\"ohlich's ideas on the r\^ole of solitons for
superconductivity and/or biological matter. By representing the MT arrangements
as cavities,we present a novel scenario on the formation of macroscopic (or
mesoscopic) quantum-coherent states, as a result of the
(quantum-electromagnetic) interactions of the MT dimers with the surrounding
molecules of the ordered water in the interior of the MT cylinders. We suggest
specific experiments to test the above-conjectured quantum nature of the
microtubular arrangements inside the cell. These experiments are similar in
nature to those in atomic physics, used in the detection of the Rabi-Vacuum
coupling between coherent cavity modes and atoms. Our conjecture is that a
similar Rabi-Vacuum-splitting phenomenon occurs in the MT case.
| [
{
"version": "v1",
"created": "Fri, 1 Aug 1997 14:42:14 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Aug 1997 10:29:50 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Mavromatos",
"N. E.",
""
],
[
"Nanopoulos",
"D. V.",
""
]
] |
quant-ph/9708004 | Sougato Bose | S.Bose, V.Vedral and P.L.Knight | A Multiparticle Generalization of Entanglement Swapping | 9 pages revtex, 7 eps figures | Phys.Rev.A57:822,1998 | 10.1103/PhysRevA.57.822 | null | quant-ph | null | We generalize the procedure of entanglement swapping to obtain a scheme for
manipulating entanglement in multiparticle systems. We describe how this scheme
allows to establish multiparticle entanglement between particles belonging to
distant users in a communication network through a prior distribution of
singlets followed by only local measurements. We show that this scheme can be
regarded as a method of generating entangled states of many particles and
compare it with existing schemes using simple quantum computational networks.
We highlight the practical advantages of using a series of entanglement
swappings during the distribution of entangled particles between two parties.
Applications of multiparticle entangled states in cryptographic conferencing
and in reading messages from more than one source through a single measurement
are also described.
| [
{
"version": "v1",
"created": "Fri, 1 Aug 1997 16:08:49 GMT"
}
] | 2008-12-30T00:00:00 | [
[
"Bose",
"S.",
""
],
[
"Vedral",
"V.",
""
],
[
"Knight",
"P. L.",
""
]
] |
quant-ph/9708005 | Jinsoo Kim | Dong Pyo Chi and Jinsoo Kim | Quantum Database Searching by a Single Query | 5 pages, LaTeX2e | Quantum Computing and Quantum Communications, First NASA
International Conference, selected papers, QCQC'98, C. P. Williams Ed. (Palm
Springs, California, USA, February 17-20, 1998), Lecture Notes in Computer
Science, Vol. 1509, pp. 148-151, Springer-Verlag, 1999; "Quantum Database
Search with Certainty by a Single Query", Chaos, Solitons, and Fractals 10
(1999), 1689-1693. | null | null | quant-ph | null | In this paper we give a quantum mechanical algorithm that can search a
database by a single query, when the number of solutions is more than a
quarter. It utilizes modified Grover operator of arbitrary phase.
| [
{
"version": "v1",
"created": "Sun, 3 Aug 1997 05:22:27 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chi",
"Dong Pyo",
""
],
[
"Kim",
"Jinsoo",
""
]
] |
quant-ph/9708006 | null | M. Asakawa and T. Csorgo | Two-mode squeezed states in high energy physics | LaTeX, 5 pages, 1 figure, uses sprocl.sty . Substantially revised
version, eq. (9) and Fig. 1 corrected. Talk given by T. Csorgo at the Strong
and Electroweak Matter'97 Conference, Eger, Hungary, May 21-25, 1997. (World
Scientific, Singapore, ed. F. Csikor et al, to appear) | Proc. SEWM'97 (WSCI 1998 ed. F. Csikor et al) p 332 | null | null | quant-ph hep-ph nucl-th | null | We discuss the possibility to observe hadron modification in hot and dense
matter via the correlation of identical particles. We find that a modification
of hadronic masses in medium leads to two-mode squeezing which signals itself
in a back-to-back correlations of hadrons. This effect leads to a signal of a
shift of $\phi$-meson mass.
| [
{
"version": "v1",
"created": "Sun, 3 Aug 1997 18:29:02 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Aug 1997 20:47:30 GMT"
}
] | 2008-02-03T00:00:00 | [
[
"Asakawa",
"M.",
""
],
[
"Csorgo",
"T.",
""
]
] |
quant-ph/9708007 | Edward R. Floyd | Edward R. Floyd | Reflection time and the Goos-H\"anchen effect for reflection by a
semi-infinite rectangular barrier | 12 Pages LaTeX 2.09. No figures. Final revision conforms to galley
page proofs. Minor revisions. To be Published in Found. Phys. Lett. Key
words: reflection time, tunnelling time, dwell time, Goos-H\"anchen,
trajectory representation, microstates | Found.Phys.Lett. 13 (2000) 235-251 | null | null | quant-ph | null | The reflection time, during which a particle is in the classically forbidden
region, is described by the trajectory representation for reflection by a
semi-infinite rectangular barrier. The Schr\"odinger wave function has
microstates for such reflection. The reflection time is a function of the
microstate. For oblique reflection, the Goos-H\"anchen displacement is also a
function of the microstate. For a square well duct, we develop a proposed test
where consistent overdetermination of the trajectory by a redundant set of
observed constants of the motion would be beyond the Copenhagen interpretation.
| [
{
"version": "v1",
"created": "Sun, 3 Aug 1997 15:36:18 GMT"
},
{
"version": "v2",
"created": "Sat, 3 Oct 1998 20:58:41 GMT"
},
{
"version": "v3",
"created": "Wed, 10 May 2000 03:49:42 GMT"
}
] | 2008-02-03T00:00:00 | [
[
"Floyd",
"Edward R.",
""
]
] |
quant-ph/9708008 | Joerg Steinbach | J. Steinbach, J.Twamley, and P.L. Knight | Engineering two-mode interactions in ion traps | 12 pages, 5 figures, to appear in PRA | null | 10.1103/PhysRevA.56.4815 | null | quant-ph | null | We describe how two vibrational degrees of freedom of a single trapped ion
can be coupled through the action of suitably-chosen laser excitation. We
concentrate on a two-dimensional ion trap with dissimilar vibrational
frequencies in the x- and y-directions of motion, and derive from first
principles a variety of quantized two-mode couplings, concentrating on a linear
coupling which takes excitations from one mode to another. We demonstrate how
this can result in a state rotation, in which it is possible to transfer the
motional state of the ion from say the x-direction to the y-direction without
prior knowledge of that motional state.
| [
{
"version": "v1",
"created": "Mon, 4 Aug 1997 11:24:55 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Steinbach",
"J.",
""
],
[
"Twamley",
"J.",
""
],
[
"Knight",
"P. L.",
""
]
] |
quant-ph/9708009 | Anna Sanpera | R. Dum, A. Sanpera, K.-A. Suominen, M. Brewczyk, M. Kus, K.
Rzcazewski, and M. Lewenstein | Wave packet dynamics with Bose-Einstein condensates | 4 pages RevTex, 3 figures | Phys.Rev.Lett.80:3899-3902,1998 | 10.1103/PhysRevLett.80.3899 | null | quant-ph | null | We study wave packet dynamics of a Bose condensate in a periodically shaken
trap. Dichotomy, that is, dynamic splitting of the condensate, and dynamic
stabilization are analyzed in analogy with similar phenomena in the domain of
atoms in strong laser fields.
| [
{
"version": "v1",
"created": "Tue, 5 Aug 1997 12:32:04 GMT"
}
] | 2009-01-23T00:00:00 | [
[
"Dum",
"R.",
""
],
[
"Sanpera",
"A.",
""
],
[
"Suominen",
"K. -A.",
""
],
[
"Brewczyk",
"M.",
""
],
[
"Kus",
"M.",
""
],
[
"Rzcazewski",
"K.",
""
],
[
"Lewenstein",
"M.",
""
]
] |
quant-ph/9708010 | Pushan Majumdar | Pushan Majumdar, H. S. Sharatchandra | Coherent states for the hydrogen atom | 9 pages, 2 figures, minor change in language and journal reference
added | Phys. Rev. A56 (1997) R3322 | 10.1103/PhysRevA.56.R3322 | imsc/97/08/33 | quant-ph | null | We construct wave packets for the hydrogen atom labelled by the classical
action-angle variables with the following properties. i) The time evolution is
exactly given by classical evolution of the angle variables. (The angle
variable corresponding to the position on the orbit is now non-compact and we
do not get exactly the same state after one period. However the gross features
do not change. In particular the wave packet remains peaked around the labels.)
ii) Resolution of identity using this overcomplete set involves exactly the
classical phase space measure. iii) Semi-classical limit is related to
Bohr-Sommerfield quantization. iv) They are almost minimum uncertainty wave
packets in position and momentum.
| [
{
"version": "v1",
"created": "Tue, 5 Aug 1997 20:30:21 GMT"
},
{
"version": "v2",
"created": "Fri, 10 Apr 1998 16:35:18 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Majumdar",
"Pushan",
""
],
[
"Sharatchandra",
"H. S.",
""
]
] |
quant-ph/9708011 | null | M. Rigo, F. Mota-Furtado, P. F. O'Mahony | Continuous stochastic Schrodinger equations and localization | 18 pages in LaTeX + 6 figures (postscript), uses ioplppt.sty. To
appear in J. Phys. A | J.Phys.A30:7557-7571,1997 | 10.1088/0305-4470/30/21/026 | null | quant-ph | null | The set of continuous norm-preserving stochastic Schrodinger equations
associated with the Lindblad master equation is introduced. This set is used to
describe the localization properties of the state vector toward eigenstates of
the environment operator. Particular focus is placed on determining the
stochastic equation which exhibits the highest rate of localization for wide
open systems. An equation having such a property is proposed in the case of a
single non-hermitian environment operator. This result is relevant to numerical
simulations of quantum trajectories where localization properties are used to
reduce the number of basis states needed to represent the system state, and
thereby increase the speed of calculation.
| [
{
"version": "v1",
"created": "Wed, 6 Aug 1997 18:31:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Rigo",
"M.",
""
],
[
"Mota-Furtado",
"F.",
""
],
[
"O'Mahony",
"P. F.",
""
]
] |
quant-ph/9708012 | Michael Martin Nieto | Michael Martin Nieto | The Discovery of Squeezed States - In 1927 | 6 pages, LaTeX, to be published in the Procxeedings of the 5th
International Conference on Squeezed States and Uncertainty Relations | null | null | LA-UR-97-2760 | quant-ph physics.hist-ph | null | I first review a) the flowering of coherent states in the 1960's, yet b) the
discovery of coherent states in 1926, and c) the flowering of squeezed states
in the 1970's and 1980's. Then, with the background of the excitement over the
then new quantum mechanics, I describe d) the discovery of squeezed states in
1927.
| [
{
"version": "v1",
"created": "Wed, 6 Aug 1997 20:19:11 GMT"
}
] | 2008-02-03T00:00:00 | [
[
"Nieto",
"Michael Martin",
""
]
] |
quant-ph/9708013 | Scutaru Horia | Horia Scutaru | Fidelity for displaced squeezed states and the oscillator semigroup | 3 pages, REVTEX, no figures, submitted to Journal of Physics A, May
5, 1997 | J.Phys.A31:3659-3663,1998 | 10.1088/0305-4470/31/15/025 | FT-428-May 5-1997 | quant-ph | null | The fidelity for two displaced squeezed thermal states is computed using the
fact that the corresponding density operators belong to the oscillator
semigroup.
| [
{
"version": "v1",
"created": "Thu, 7 Aug 1997 10:38:24 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Scutaru",
"Horia",
""
]
] |
quant-ph/9708014 | Steck | H. Steck, M. Naraschewski, H. Wallis | Output of a pulsed atom laser | 4 pages, RevTeX. Full ps file available on
http://mpqibmr1.mpq.mpg.de:5000/~man/ | Phys.Rev.Lett.80:1-5,1998 | 10.1103/PhysRevLett.80.1 | null | quant-ph cond-mat.stat-mech physics.atom-ph | null | We study the output properties of a pulsed atom laser consisting of an
interacting Bose-Einstein condensate (BEC) in a magnetic trap and an additional
rf field transferring atoms to an untrapped Zeeman sublevel. For weak output
coupling we calculate the dynamics of the decaying condensate population, of
its chemical potential and the velocity of the output atoms analytically.
| [
{
"version": "v1",
"created": "Thu, 7 Aug 1997 14:53:56 GMT"
},
{
"version": "v2",
"created": "Fri, 8 Aug 1997 09:12:03 GMT"
}
] | 2009-01-23T00:00:00 | [
[
"Steck",
"H.",
""
],
[
"Naraschewski",
"M.",
""
],
[
"Wallis",
"H.",
""
]
] |
quant-ph/9708015 | Michal Horodecki | Michal Horodecki and Pawel Horodecki | Reduction criterion of separability and limits for a class of protocols
of entanglement distillation | RevTeX, 13 pages, rewritten to more readable form, some details added | null | null | null | quant-ph | null | We analyse the problem of distillation of entanglement of mixed states in
higher dimensional compound systems. Employing the positive maps method [M.
Horodecki et al., Phys. Lett. A 223 1 (1996)] we introduce and analyse a
criterion of separability which relates the structures of the total density
matrix and its reductions. We show that any state violating the criterion can
be distilled by suitable generalization of the two-qubit protocol which
distills any inseparable two-qubit state. Conversely, all the states which can
be distilled by such a protocol must violate the criterion. The proof involves
construction of the family of states which are invariant under transformation
$\varrho\to U\otimes U^*\varrho U^\dagger\otimes U^{*\dagger}$ where $U$ is a
unitary transformation and star denotes complex conjugation. The states are
related to the depolarizing channel generalized to non-binary case.
| [
{
"version": "v1",
"created": "Thu, 7 Aug 1997 13:01:50 GMT"
},
{
"version": "v2",
"created": "Fri, 6 Feb 1998 15:53:58 GMT"
},
{
"version": "v3",
"created": "Thu, 9 Apr 1998 14:21:04 GMT"
}
] | 2008-02-03T00:00:00 | [
[
"Horodecki",
"Michal",
""
],
[
"Horodecki",
"Pawel",
""
]
] |
quant-ph/9708016 | Richard Cleve | Richard Cleve, Artur Ekert, Chiara Macchiavello, and Michele Mosca | Quantum Algorithms Revisited | 18 pages, LaTeX, 7 figures. Submitted to Proc. Roy. Soc. Lond. A | null | 10.1098/rspa.1998.0164 | null | quant-ph | null | Quantum computers use the quantum interference of different computational
paths to enhance correct outcomes and suppress erroneous outcomes of
computations. A common pattern underpinning quantum algorithms can be
identified when quantum computation is viewed as multi-particle interference.
We use this approach to review (and improve) some of the existing quantum
algorithms and to show how they are related to different instances of quantum
phase estimation. We provide an explicit algorithm for generating any
prescribed interference pattern with an arbitrary precision.
| [
{
"version": "v1",
"created": "Fri, 8 Aug 1997 17:56:53 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Cleve",
"Richard",
""
],
[
"Ekert",
"Artur",
""
],
[
"Macchiavello",
"Chiara",
""
],
[
"Mosca",
"Michele",
""
]
] |
quant-ph/9708017 | M. Dakna | T. Opatrny, M. Dakna, and D.-G. Welsch | Exponential Moments of Canonical Phase: Homodyne Measurements | Presented at the 5-th International Conference on Squeezed States and
Uncertainty Relations (4 ps-figures) | null | null | null | quant-ph | null | A method for direct sampling of the exponential moments of canonical phase
from the data recorded in balanced homodyne detection is presented. Analytical
expressions for the sampling functions are shown which are valid for arbitrary
states. A numerical simulation illustrates the applicability of the method and
compares it with the direct measurement of phase by means of double homodyning.
| [
{
"version": "v1",
"created": "Sat, 9 Aug 1997 14:40:42 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Opatrny",
"T.",
""
],
[
"Dakna",
"M.",
""
],
[
"Welsch",
"D. -G.",
""
]
] |
quant-ph/9708018 | M. Dakna | D.-G. Welsch, M. Dakna, L. Knoll, and T. Opatrny | Photon adding and subtracting and Schroedinger-cat generation in
conditional output measurement on a beam splitter | Presented at the 5-th International Conference on Squeezed States and
Uncertainty Relations (4 ps-figures) | null | null | null | quant-ph | null | The problem of photon adding and subtracting is studied, using conditional
output measurement on a beam splitter. It is shown that for various classes of
states the corresponding photon-added and -subtracted states can be prepared.
Analytical results are presented, with special emphasis on photon-added and
-subtracted squeezed vacuum states, which are found to represent two different
types of Schroedinger-cat-like states. Effects of realistic photocounting and
Fock-state preparation are discussed.
| [
{
"version": "v1",
"created": "Sat, 9 Aug 1997 14:57:58 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Welsch",
"D. -G.",
""
],
[
"Dakna",
"M.",
""
],
[
"Knoll",
"L.",
""
],
[
"Opatrny",
"T.",
""
]
] |
quant-ph/9708019 | Richard Cleve | Richard Cleve (U of Calgary), Wim van Dam (U of Oxford and CWI),
Michael Nielsen (Los Alamos National Laboratory and U of New Mexico), Alain
Tapp (U de Montreal) | Quantum Entanglement and the Communication Complexity of the Inner
Product Function | 14 pages, LaTeX w/ llncs style, no figures, made changes in notation
in order to be consistent with other papers. To appear in Proceedings of the
1st NASA International Conference on Quantum Computing and Quantum
Communications (Springer-Verlag) | Lect.Notes Comput.Sci. 1509 (1998) 61-74 | null | null | quant-ph | null | We consider the communication complexity of the binary inner product function
in a variation of the two-party scenario where the parties have an a priori
supply of particles in an entangled quantum state. We prove linear lower bounds
for both exact protocols, as well as for protocols that determine the answer
with bounded-error probability. Our proofs employ a novel kind of "quantum"
reduction from a quantum information theory problem to the problem of computing
the inner product. The communication required for the former problem can then
be bounded by an application of Holevo's theorem. We also give a specific
example of a probabilistic scenario where entanglement reduces the
communication complexity of the inner product function by one bit.
| [
{
"version": "v1",
"created": "Mon, 11 Aug 1997 03:22:05 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Feb 1998 01:20:06 GMT"
},
{
"version": "v3",
"created": "Thu, 12 Mar 1998 01:16:20 GMT"
}
] | 2008-02-03T00:00:00 | [
[
"Cleve",
"Richard",
"",
"U of Calgary"
],
[
"van Dam",
"Wim",
"",
"U of Oxford and CWI"
],
[
"Nielsen",
"Michael",
"",
"Los Alamos National Laboratory and U of New Mexico"
],
[
"Tapp",
"Alain",
"",
"U de Montreal"
]
] |
quant-ph/9708020 | Alan Kostelecky | Alan Kostelecky and Neil Russell | Analytical Models for Valence Fermions in Isotropic Traps | accepted for publication in Physics Letters A | Phys.Lett.A235:305,1997 | 10.1016/S0375-9601(97)00631-2 | IUHET 352, December 1996 | quant-ph | null | For isotropic confining Ioffe-Pritchard or TOP potentials, a valence fermion
trapped with a closed core of other fermions can be described by an analytical
effective one-particle model with a physical eigenspectrum. Related
constructions exist for Paul and Penning traps. The analytical models arise
from quantum-mechanical supersymmetry.
| [
{
"version": "v1",
"created": "Mon, 11 Aug 1997 18:47:14 GMT"
}
] | 2009-09-25T00:00:00 | [
[
"Kostelecky",
"Alan",
""
],
[
"Russell",
"Neil",
""
]
] |
quant-ph/9708021 | Andrew Steane | Andrew Steane (Clarendon Laboratory, Oxford University) | Space, time, parallelism and noise requirements for reliable quantum
computing | LaTeX, 9 pages plus 6 figures | Fortsch.Phys. 46 (1998) 443-458 | 10.1002/(SICI)1521-3978(199806)46:4/5<443::AID-PROP443>3.0.CO;2-8 | null | quant-ph | null | Quantum error correction methods use processing power to combat noise. The
noise level which can be tolerated in a fault-tolerant method is therefore a
function of the computational resources available, especially the size of
computer and degree of parallelism. I present an analysis of error correction
with block codes, made fault-tolerant through the use of prepared ancilla
blocks. The preparation and verification of the ancillas is described in
detail. It is shown that the ancillas need only be verified against a small set
of errors. This, combined with previously known advantages, makes this `ancilla
factory' the best method to apply error correction, whether in concatenated or
block coding. I then consider the resources required to achieve $2 \times
10^{10}$ computational steps reliably in a computer of 2150 logical qubits,
finding that the simplest $[[n,1,d]]$ block codes can tolerate more noise with
smaller overheads than the $7^L$-bit concatenated code. The scaling is such
that block codes remain the better choice for all computations one is likely to
contemplate.
| [
{
"version": "v1",
"created": "Tue, 12 Aug 1997 13:12:16 GMT"
}
] | 2015-06-26T00:00:00 | [
[
"Steane",
"Andrew",
"",
"Clarendon Laboratory, Oxford University"
]
] |
quant-ph/9708022 | Andrew Steane | Andrew Steane (Clarendon Laboratory, Oxford University) | Quantum Computing | This is a review for Reports on Progress in Physics, at a level
suitable for physicists new to the subject, such as graduate students. 52
pages LaTeX plus 14 encapsulated PostScript figures. Replaced version
corrects minor errors and omissions, and improves some notations | Rept.Prog.Phys.61:117-173,1998 | 10.1088/0034-4885/61/2/002 | null | quant-ph | null | The subject of quantum computing brings together ideas from classical
information theory, computer science, and quantum physics. This review aims to
summarise not just quantum computing, but the whole subject of quantum
information theory. It turns out that information theory and quantum mechanics
fit together very well. In order to explain their relationship, the review
begins with an introduction to classical information theory and computer
science, including Shannon's theorem, error correcting codes, Turing machines
and computational complexity. The principles of quantum mechanics are then
outlined, and the EPR experiment described. The EPR-Bell correlations, and
quantum entanglement in general, form the essential new ingredient which
distinguishes quantum from classical information theory, and, arguably, quantum
from classical physics. Basic quantum information ideas are described,
including key distribution, teleportation, data compression, quantum error
correction, the universal quantum computer and quantum algorithms. The common
theme of all these ideas is the use of quantum entanglement as a computational
resource. Experimental methods for small quantum processors are briefly
sketched, concentrating on ion traps, high Q cavities, and NMR. The review
concludes with an outline of the main features of quantum information physics,
and avenues for future research.
| [
{
"version": "v1",
"created": "Tue, 12 Aug 1997 13:21:47 GMT"
},
{
"version": "v2",
"created": "Wed, 24 Sep 1997 13:24:19 GMT"
}
] | 2011-07-19T00:00:00 | [
[
"Steane",
"Andrew",
"",
"Clarendon Laboratory, Oxford University"
]
] |
quant-ph/9708023 | Hiroki Saito | Hiroki Saito and Masahito Ueda | Quantum-Controlled Few-Photon State Generated by Squeezed Atoms | 5 pages, RevTex, uses eclepsf.sty. The change is only one sentence
referring to Ref.[4,7]. Accepted for publication in Physical Review Letters | Phys.Rev.Lett.79:3869,1997 | 10.1103/PhysRevLett.79.3869 | null | quant-ph physics.optics | null | General principles and experimental schemes for generating a desired
few-photon state from an aggregate of squeezed atoms are presented.
Quantum-statistical information of the collective atomic dipole is found to be
faithfully transferred to the photon state even in a few-photon regime. The
controllability of few-photon states is shown to increase with increasing the
number of squeezed atoms.
| [
{
"version": "v1",
"created": "Wed, 13 Aug 1997 13:41:23 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Sep 1997 12:04:22 GMT"
}
] | 2009-01-23T00:00:00 | [
[
"Saito",
"Hiroki",
""
],
[
"Ueda",
"Masahito",
""
]
] |
quant-ph/9708024 | Bronius Kaulakys | B. Kaulakys and V. Gontis (ITPA, Vilnius, Lithuania) | Quantum anti-Zeno effect | 12 pages with 2 figures | Phys.Rev.A56:1131-1137,1997 | 10.1103/PhysRevA.56.1131 | null | quant-ph chao-dyn nlin.CD | null | Prevention of a quantum system's time evolution by repetitive, frequent
measurements of the system's state has been called the quantum Zeno effect (or
paradox). Here we investigate theoretically and numerically the effect of
repeated measurements on the quantum dynamics of the multilevel systems that
exhibit the quantum localization of the classical chaos. The analysis is based
on the wave function and Schroedinger equation, without introduction of the
density matrix. We show how the quantum Zeno effect in simple few-level systems
can be recovered and understood by formal modeling the measurement effect on
the dynamics by randomizing the phases of the measured states. Further the
similar analysis is extended to investigate of the dynamics of multilevel
systems driven by an intense external force and affected by frequent
measurement. We show that frequent measurements of such quantum systems results
in the delocalization of the quantum suppression of the classical chaos. This
result is the opposite of the quantum Zeno effect. The phenomenon of
delocalization of the quantum suppression and restoration of the classical-like
time evolution of these quasiclassical systems, owing to repetitive frequent
measurements, can therefore be called the 'quantum anti-Zeno effect'. From this
analysis we furthermore conclude that frequently or continuously observable
quasiclassical systems evolve basically in a classical manner.
| [
{
"version": "v1",
"created": "Wed, 13 Aug 1997 15:45:30 GMT"
}
] | 2011-08-04T00:00:00 | [
[
"Kaulakys",
"B.",
"",
"ITPA, Vilnius, Lithuania"
],
[
"Gontis",
"V.",
"",
"ITPA, Vilnius, Lithuania"
]
] |
quant-ph/9708025 | Dmitri Fedorov | E. Nielsen, D. V. Fedorov and A. S. Jensen (IFA, Aarhus University,
Aarhus, Denmark) | Three-Body Halos in Two Dimensions | 9 pages, 2 postscript figures, LaTeX, epsf.sty | Phys.Rev. A56 (1997) 3287 | 10.1103/PhysRevA.56.3287 | null | quant-ph | null | A method to study weakly bound three-body quantum systems in two dimensions
is formulated in coordinate space for short-range potentials. Occurrences of
spatially extended structures (halos) are investigated. Borromean systems are
shown to exist in two dimensions for a certain class of potentials. An
extensive numerical investigation shows that a weakly bound two-body state
gives rise to two weakly bound three-body states, a reminiscence of the Efimov
effect in three dimensions. The properties of these two states in the weak
binding limit turn out to be universal.
PACS number(s): 03.65.Ge, 21.45.+v, 31.15.Ja, 02.60Nm
| [
{
"version": "v1",
"created": "Wed, 13 Aug 1997 15:07:25 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Nielsen",
"E.",
"",
"IFA, Aarhus University,\n Aarhus, Denmark"
],
[
"Fedorov",
"D. V.",
"",
"IFA, Aarhus University,\n Aarhus, Denmark"
],
[
"Jensen",
"A. S.",
"",
"IFA, Aarhus University,\n Aarhus, Denmark"
]
] |
quant-ph/9708026 | Ned Lynne Floyd | Edward R. Floyd | Which causality? Differences between the trajectory and Copenhagen
analyses of an impulsive perturbation | 12 pages of LaTeX 2.09. No figures. Errata [Int. J. Mod. Phys. A16
(2001) 2447] appended to end. The errata strengthen the findings. Key words:
causality, hidden variables, trajectory interpretation, Copenhagen
interpretation, interpretations of quantum mechanics, impulse perturbations | Int.J.Mod.Phys. A14 (1999) 1111-1124 | 10.1142/S0217751X99000555 | null | quant-ph | null | The trajectory and Copenhagen representations render different predictions
for impulse perturbations. The different predictions are due to the different
roles that causality plays in the trajectory and Copenhagen interpretations. We
investigate a small perturbing impulse acting on the ground state of an
infinitely deep square well. For the two representations, the first-order
perturbation calculations for the temporal change in energy differ. This
temporal change in energy for the trajectory representation is dependent upon
the microstate of the wave function. We show that even under Copenhagen
epistemology, the two representations predict different theoretical results.
| [
{
"version": "v1",
"created": "Wed, 13 Aug 1997 16:21:13 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Feb 1998 01:28:36 GMT"
},
{
"version": "v3",
"created": "Sat, 17 Oct 1998 15:21:53 GMT"
},
{
"version": "v4",
"created": "Sat, 6 Feb 1999 14:31:42 GMT"
},
{
"version": "v5",
"created": "Thu, 6 Mar 2003 04:53:47 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Floyd",
"Edward R.",
""
]
] |
quant-ph/9708027 | Georg Junker | Georg Junker, John R. Klauder | Coherent-state quantization of constrained fermion systems | LaTeX 2e, Springer macro pljour2, 11 pages, to appear in Z. Phys. C | Eur.Phys.J.C4:173-183,1998 | 10.1007/s100520050195 | null | quant-ph hep-th | null | The quantization of systems with first- and second-class constraints within
the coherent-state path-integral approach is extended to quantum systems with
fermionic degrees of freedom. As in the bosonic case the importance of
path-integral measures for Lagrange multipliers, which in this case are in
general expected to be elements of a Grassmann algebra, is emphasized. Several
examples with first- and second-class constraints are discussed.
| [
{
"version": "v1",
"created": "Thu, 14 Aug 1997 14:00:04 GMT"
}
] | 2011-09-13T00:00:00 | [
[
"Junker",
"Georg",
""
],
[
"Klauder",
"John R.",
""
]
] |
quant-ph/9708028 | Robert B. Griffiths | Robert B. Griffiths | Choice of Consistent Family, and Quantum Incompatibility | Minor revisions to bring into conformity with published version.
Revtex 29 pages including 1 page with figures | Phys.Rev. A57 (1998) 1604 | 10.1103/PhysRevA.57.1604 | null | quant-ph | null | In consistent history quantum theory, a description of the time development
of a quantum system requires choosing a framework or consistent family, and
then calculating probabilities for the different histories which it contains.
It is argued that the framework is chosen by the physicist constructing a
description of a quantum system on the basis of questions he wishes to address,
in a manner analogous to choosing a coarse graining of the phase space in
classical statistical mechanics. The choice of framework is not determined by
some law of nature, though it is limited by quantum incompatibility, a concept
which is discussed using a two-dimensional Hilbert space (spin half particle).
Thus certain questions of physical interest can only be addressed using
frameworks in which they make (quantum mechanical) sense. The physicist's
choice does not influence reality, nor does the presence of choices render the
theory subjective. On the contrary, predictions of the theory can, in
principle, be verified by experimental measurements. These considerations are
used to address various criticisms and possible misunderstandings of the
consistent history approach, including its predictive power, whether it
requires a new logic, whether it can be interpreted realistically, the nature
of ``quasiclassicality'', and the possibility of ``contrary'' inferences.
| [
{
"version": "v1",
"created": "Thu, 14 Aug 1997 18:43:41 GMT"
},
{
"version": "v2",
"created": "Thu, 31 Dec 1998 15:22:32 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Griffiths",
"Robert B.",
""
]
] |
quant-ph/9708029 | M. Czachor | Marek Czachor and Maciej Kuna (Politechnika Gdanska) | Complete positivity of nonlinear evolution: A case study | extended version, 3 appendices added (on mixed states, projection
postulate, nonlocality), to be published in Phys. Rev. A | Phys.Rev. A58 (1998) 128 | 10.1103/PhysRevA.58.128 | null | quant-ph chao-dyn funct-an hep-th math.FA nlin.CD | null | Simple Hartree-type equations lead to dynamics of a subsystem that is not
completely positive in the sense accepted in mathematical literature. In the
linear case this would imply that negative probabilities have to appear for
some system that contains the subsystem in question. In the nonlinear case this
does not happen because the mathematical definition is physically unfitting as
shown on a concrete example.
| [
{
"version": "v1",
"created": "Fri, 15 Aug 1997 16:18:51 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Nov 1997 11:03:55 GMT"
},
{
"version": "v3",
"created": "Tue, 7 Apr 1998 17:56:40 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Czachor",
"Marek",
"",
"Politechnika Gdanska"
],
[
"Kuna",
"Maciej",
"",
"Politechnika Gdanska"
]
] |
quant-ph/9708030 | Soren Bay | Soren Bay, P. Lambropoulos and K. Molmer | Fluorescence into flat and structured radiation continua: An atomic
density matrix without a master equation | 4 pages, 4 figures. To appear in Phys. Rev. Lett | null | 10.1103/PhysRevLett.79.2654 | null | quant-ph | null | We investigate an atomic $\Lambda$-system with one transition coupled to a
laser field and a flat continuum of vacuum modes and the other transition
coupled to field modes near the edge of a photonic band gap. The system
requires simultaneous treatment of Markovian and non-Markovian dissipation
processes, but the photonic band gap continuum can not be eliminated within a
density matrix treatment. Instead we propose a formalism based on Monte-Carlo
wavefunctions, and we present results relevant to an experimental
characterization of a structured continuum.
| [
{
"version": "v1",
"created": "Sun, 17 Aug 1997 13:09:41 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Bay",
"Soren",
""
],
[
"Lambropoulos",
"P.",
""
],
[
"Molmer",
"K.",
""
]
] |
quant-ph/9708031 | Holger Hofmann | Holger F. Hofmann, Ortwin Hess and Guenter Mahler | Quantum control by compensation of quantum fluctuations | 5 pages RevTex and 2 figures, to be published in Optics Express | Optics Express 2, 339 (1998) | 10.1364/OE.2.000339 | null | quant-ph physics.atom-ph physics.optics | null | We show that the influence of quantum fluctuations in the electromagnetic
field vacuum on a two level atom can be measured and consequently compensated
by balanced homodyne detection and a coherent feedback field. This compensation
suppresses the decoherence associated with spontaneous emission for a specific
state of the atomic system allowing complete control of the coherent state of
the system.
| [
{
"version": "v1",
"created": "Tue, 19 Aug 1997 09:38:46 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Apr 1998 09:49:53 GMT"
}
] | 2015-06-26T00:00:00 | [
[
"Hofmann",
"Holger F.",
""
],
[
"Hess",
"Ortwin",
""
],
[
"Mahler",
"Guenter",
""
]
] |
quant-ph/9708032 | Steven van Enk | S.J. van Enk, J.I. Cirac, P. Zoller | Purifying two-bit quantum gates and joint measurements in cavity QED | 4 pages RevTeX, 2 figures included | null | 10.1103/PhysRevLett.79.5178 | null | quant-ph | null | Using a cavity QED setup we show how to implement a particular joint
measurement on two atoms in a fault tolerant way. Based on this scheme, we
illustrate how to realize quantum communication over a noisy channel when local
operations are subject to errors. We also present a scheme to perform and
purify a universal two-bit gate.
| [
{
"version": "v1",
"created": "Tue, 19 Aug 1997 16:31:53 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"van Enk",
"S. J.",
""
],
[
"Cirac",
"J. I.",
""
],
[
"Zoller",
"P.",
""
]
] |
quant-ph/9708033 | Marcos Protopapas | M. Protopapas, D.G. Lappas and P.L. Knight | Strong Field Ionization in Arbitrary Laser Polarizations | 10 pages, Revtex, 5 figures (2 gif, 3 eps) | null | 10.1103/PhysRevLett.79.4550 | null | quant-ph | null | We present a numerical method for investigating the non-perturbative quantum
mechanical interaction of light with atoms in two dimensions, without a basis
expansion. This enables us to investigate intense laser-atom interactions with
light of arbitrary polarization without approximation. Results are presented
for the dependence of ionization and high harmonic generation on ellipticity
seen in recent experiments. Strong evidence of stabilization in circular
polarization is found.
| [
{
"version": "v1",
"created": "Wed, 20 Aug 1997 15:07:34 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Protopapas",
"M.",
""
],
[
"Lappas",
"D. G.",
""
],
[
"Knight",
"P. L.",
""
]
] |
quant-ph/9708034 | Avi Marhavka | A. Marchewka and Z. Schuss | Feynman Integrals with Absorbing Boundaries | 4 pages, revtex | Phys.Lett. A240 (1998) 177-184 | 10.1016/S0375-9601(98)00107-8 | TAUP-2401-96 | quant-ph cond-mat | null | We propose a formulation of an absorbing boundary for a quantum particle. The
formulation is based on a Feynman-type integral over trajectories that are
confined to the non-absorbing region. Trajectories that reach the absorbing
wall are discounted from the population of the surviving trajectories with a
certain weighting factor. Under the assumption that absorbed trajectories do
not interfere with the surviving trajectories, we obtain a time dependent
absorption law. Two examples are worked out.
| [
{
"version": "v1",
"created": "Thu, 21 Aug 1997 10:08:54 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Marchewka",
"A.",
""
],
[
"Schuss",
"Z.",
""
]
] |
quant-ph/9708035 | Dr. Luca Salasnich, . D. | Luca Salasnich and Fabio Sattin | SWKB for the Angular Momentum | latex, 9 pages, no figures, to be published in Modern Physics Letters
B | null | 10.1142/S0217984997000992 | null | quant-ph | null | In this paper we solve the eigenvalue problem of the angular momentum
operator by using the supersymmetric semiclassical quantum mechanics (SWKB),
and show that it gives the correct quantization already at the leading order.
| [
{
"version": "v1",
"created": "Fri, 22 Aug 1997 11:47:22 GMT"
}
] | 2015-06-26T00:00:00 | [
[
"Salasnich",
"Luca",
""
],
[
"Sattin",
"Fabio",
""
]
] |
quant-ph/9708036 | Dr. Luca Salasnich, . D. | Luca Salasnich and Fabio Sattin | On the Convergence of the WKB Series for the Angular Momentum Operator | latex, 9 pages, no figures, to be published in Journal of Physics A:
Math. and Gen | J.Phys.A30:7597-7602,1997 | 10.1088/0305-4470/30/21/028 | null | quant-ph | null | In this paper we prove a recent conjecture [Robnik M and Salasnich L 1997 J.
Phys. A: Math. Gen. 30 1719] about the convergence of the WKB series for the
angular momentum operator. We demonstrate that the WKB algorithm for the
angular momentum gives the exact quantization formula if all orders are summed.
| [
{
"version": "v1",
"created": "Fri, 22 Aug 1997 11:47:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Salasnich",
"Luca",
""
],
[
"Sattin",
"Fabio",
""
]
] |
quant-ph/9708037 | R. Simon | R. Simon and N. Mukunda | Moments of the Wigner Distribution and a Generalized Uncertainty
Principle | REVTex, no figures, 9 pages | null | null | null | quant-ph | null | The nonnegativity of the density operator of a state is faithfully coded in
its Wigner distribution, and this places constraints on the moments of the
Wigner distribution. These constraints are presented in a canonically invariant
form which is both concise and explicit. Since the conventional uncertainty
principle is such a constraint on the first and second moments, our result
constitutes a generalization of the same to all orders. Possible application in
quantum state reconstruction using optical homodyne tomography is noted.
| [
{
"version": "v1",
"created": "Fri, 22 Aug 1997 12:37:02 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Simon",
"R.",
""
],
[
"Mukunda",
"N.",
""
]
] |
quant-ph/9708038 | Arvind | R. Simon and Mary Selvadoray and Arvind and N. Mukunda | Nonclassicality and the concept of local constraints on the photon
number distribution | Five pages in revtex with one ps figure included using epsf | null | null | null | quant-ph | null | We exploit results from the classical Stieltjes moment problem to bring out
the totality of all the information regarding phase insensitive nonclassicality
of a state as captured by the photon number distribution p_n. Central to our
approach is the realization that n !p_n constitutes the sequence of moments of
a (quasi) probability distribution, notwithstanding the fact that p_n can by
itself be regarded as a probability distribution. This leads to classicality
restrictions on p_n that are local in n involving p_n's for only a small number
of consecutive n's, enabling a critical examination of the conjecture that
oscillation in p_n is a signature of nonclassicality.
| [
{
"version": "v1",
"created": "Sat, 23 Aug 1997 04:16:37 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Simon",
"R.",
""
],
[
"Selvadoray",
"Mary",
""
],
[
"Arvind",
"",
""
],
[
"Mukunda",
"N.",
""
]
] |
quant-ph/9708039 | M. Dakna | M. Dakna, T. Opatrny, and D. G. Welsch | Homodyne measurement of exponential phase moments | 6 figures (divided in subfigures) using a4.sty | null | 10.1016/S0030-4018(97)00701-3 | null | quant-ph | null | It is shown that the exponential moments of the canonical phase can be
directly sampled from the data recorded in balanced homodyne detection.
Analytical expressions for the sampling functions are derived, which are valid
for arbitrary states and bridge the gap between quantum and classical phase.
The reconstruction of the canonical phase distribution from the experimentally
determined exponential moments is discussed.
| [
{
"version": "v1",
"created": "Sat, 23 Aug 1997 12:45:20 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Dakna",
"M.",
""
],
[
"Opatrny",
"T.",
""
],
[
"Welsch",
"D. G.",
""
]
] |
quant-ph/9708040 | null | H. Bechmann-Pasquinucci, B. Huttner, N. Gisin | Nonlinear quantum state transformation of spin-1/2 | 12 pages, LaTeX, amssym, epsfig (2 figures included) | Phys.Lett. A242 (1998) 198-204 | 10.1016/S0375-9601(98)00189-3 | null | quant-ph | null | A non-linear quantum state transformation is presented. The transformation,
which operates on pairs of spin-1/2, can be used to distinguish optimally
between two non-orthogonal states. Similar transformations applied locally on
each component of an entangled pair of spin-1/2 can be used to transform a
mixed nonlocal state into a quasi-pure maximally entangled singlet state. In
both cases the transformation makes use of the basic building block of the
quantum computer, namely the quantum-XOR gate.
| [
{
"version": "v1",
"created": "Sat, 23 Aug 1997 16:56:58 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Bechmann-Pasquinucci",
"H.",
""
],
[
"Huttner",
"B.",
""
],
[
"Gisin",
"N.",
""
]
] |
quant-ph/9708041 | Funahasi | Kazuyuki Fujii and Kunio Funahashi | Extension of the Barut-Girardello Coherent State and Path Integral II | latex, no figure, 14 pages | J.Math.Phys. 38 (1997) 4422-4434 | 10.1063/1.532134 | null | quant-ph | null | We have constructed the coherent state of $U(N,1)$, which is an extension of
the Barut-Girardello (BG) coherent state of $SU(1,1)$, in our previous paper.
However there is a restriction that the eigenvalue of the Casimir operator is
natural number. In this paper we construct the coherent state in the analytic
representation to overcome this restriction. Next we show that the measure of
the BG coherent state is not the symplectic induced measure.
| [
{
"version": "v1",
"created": "Mon, 25 Aug 1997 08:16:54 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Fujii",
"Kazuyuki",
""
],
[
"Funahashi",
"Kunio",
""
]
] |
quant-ph/9708042 | Paolo Zanardi | P. Zanardi (1,2), ((1) ISI Foundation, Villa Gualino, Torino (2) INFM,
Politecnico di Torino) | Dissipative dynamics in a quantum register | to appear on Phys. Rev. A, 8 pages + 5 postscript figures | Phys.Rev.A56:4445,1997 | 10.1103/PhysRevA.56.4445 | null | quant-ph | null | A model for a quantum register dissipatively coupled with a bosonic thermal
bath is studied. The register consists of $N$ qubits (i.e. spin ${1/2}$ degrees
of freedom), the bath is described by $N_b$ bosonic modes. The register-bath
coupling is chosen in such a way that the total number of excitations is
conserved. The Hilbert space splits allowing the study of the dynamics
separately in each sector. Assuming that the coupling with the bath is the same
for all qubits, the excitation sectors have a further decomposition according
the irreducible representations of the $su(2)$ spin algebra. The stability
against environment-generated noise of the information encoded in a quantum
state of the register depends on its $su(2)$ symmetry content. At zero
temperature we find that states belonging to the vacuum symmetry sector have
for long time vanishing fidelity, whereas each lowest spin vector is decoupled
from the bath and therefore is decoherence free. Numerical results are shown in
the one-excitation space in the case qubit-dependent bath-system coupling.
| [
{
"version": "v1",
"created": "Mon, 25 Aug 1997 12:43:45 GMT"
}
] | 2011-08-04T00:00:00 | [
[
"Zanardi",
"P.",
""
]
] |
quant-ph/9708043 | Benni Reznik | Y. Aharonov, T. Kaufherr, S. Popescu, B. Reznik | Quantum Measurement Back-Reaction and Induced Toplogical Phases | 7 pages, Latex. Revised article. A detailed description of the regime
of validity has been added. To appear in Phys. Rev. Lett | Phys.Rev.Lett. 80 (1998) 2023-2026 | 10.1103/PhysRevLett.80.2023 | LAUR-97-1588 | quant-ph | null | It is shown that a topological vector-potential (Berry phase) is induced by
the act of measuring angular momentum in a direction defined by a reference
particle. This vector potential appears as a consequence of the back-reaction
due to the quantum measurement.
| [
{
"version": "v1",
"created": "Mon, 25 Aug 1997 18:28:44 GMT"
},
{
"version": "v2",
"created": "Thu, 29 Jan 1998 18:33:35 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Aharonov",
"Y.",
""
],
[
"Kaufherr",
"T.",
""
],
[
"Popescu",
"S.",
""
],
[
"Reznik",
"B.",
""
]
] |
quant-ph/9708044 | Gyula Bene | Gyula Bene (Institute for Solid State Physics, Eo"tvo"s University,
Budapest) | Explanation of the violation of Bell's inequality by maintaining
Einstein separability | 4 pages, RevTeX | null | null | null | quant-ph | null | A new interpretation offers a consistent conceptual basis for nonrelativistic
quantum mechanics. The violation of Bell's inequality is explained by
maintaining realism, inductive inference and Einstein separability.
| [
{
"version": "v1",
"created": "Tue, 26 Aug 1997 19:45:05 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bene",
"Gyula",
"",
"Institute for Solid State Physics, Eo\"tvo\"s University,\n Budapest"
]
] |
quant-ph/9708045 | Gyula Bene | Gyula Bene (Institute for Solid State Physics, Eo"tvo"s University,
Budapest) | On the solution of the EPR paradox and the explanation of the violation
of Bell's inequality | 17 pages, LaTeX | null | null | null | quant-ph | null | A new interpretation offers a consistent conceptual basis for nonrelativistic
quantum mechanics. The Einstein-Podolsky-Rosen (EPR) paradox is solved and the
violation of Bell's inequality is explained by maintaining realism, inductive
inference and Einstein separability.
| [
{
"version": "v1",
"created": "Wed, 27 Aug 1997 08:14:36 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bene",
"Gyula",
"",
"Institute for Solid State Physics, Eo\"tvo\"s University,\n Budapest"
]
] |
quant-ph/9708046 | Alexander S. Holevo | A.S.Holevo (Steklov Mathematical Institute) | Coding Theorems for Quantum Communication Channels | 15 pages, Latex, no figures | null | null | null | quant-ph | null | The more than thirty years old issue of the information capacity of quantum
communication channels was dramatically clarified during the last period, when
a number of direct quantum coding theorems was discovered. To considerable
extent this progress is due to an interplay between the quantum communication
theory and quantum information ideas related to more recent development in
quantum computing. It is remarkable, however, that many probabilistic tools
underlying the treatment of quantum case have their roots, and in some cases
direct prototypes, in classical Shannon's theory. This paper presents an
outline of some basic ideas and results in that direction.
| [
{
"version": "v1",
"created": "Wed, 27 Aug 1997 10:33:18 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Holevo",
"A. S.",
"",
"Steklov Mathematical Institute"
]
] |
quant-ph/9708047 | Johann Summhammer | Johann Summhammer (Atominstitut, A-1020 Vienna, Austria) | Factoring and Fourier Transformation with a Mach-Zehnder Interferometer | 5 pages, 2 postscript figures; to appear in Phys.Rev.A, Nov. 1997;
Figures contained only in replaced version | null | 10.1103/PhysRevA.56.4324 | null | quant-ph | null | The scheme of Clauser and Dowling (Phys. Rev. A 53, 4587 (1996)) for
factoring $N$ by means of an N-slit interference experiment is translated into
an experiment with a single Mach-Zehnder interferometer. With dispersive phase
shifters the ratio of the coherence length to wavelength limits the numbers
that can be factored. A conservative estimate permits $N \approx 10^7$. It is
furthermore shown, that sine and cosine Fourier coefficients of a real periodic
function can be obtained with such an interferometer.
| [
{
"version": "v1",
"created": "Wed, 27 Aug 1997 14:56:17 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Aug 1997 15:05:50 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Summhammer",
"Johann",
"",
"Atominstitut, A-1020 Vienna, Austria"
]
] |
quant-ph/9708048 | Johann Summhammer | Meinrad Hafner(1) and Johann Summhammer(2) ((1) Institute of
Astronomy, University of Vienna; (2) Atominstitut, Vienna, Austria) | Experiment on Interaction-Free Measurement in Neutron Interferometry | 8 pages, 4 postscript figures; submitted to Phys.Lett.A; Figures
contained only in replaced version | null | 10.1016/S0375-9601(97)00696-8 | null | quant-ph | null | A neutron interferometric test of interaction-free detection of the presence
of an absorbing object in one arm of a neutron interferometer has been
performed. Despite deviations from the ideal performance characteristics of a
Mach-Zehnder interferometer it could be shown that information is obtained
without interaction.
| [
{
"version": "v1",
"created": "Wed, 27 Aug 1997 14:57:32 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Aug 1997 15:03:56 GMT"
}
] | 2009-10-30T00:00:00 | [
[
"Hafner",
"Meinrad",
""
],
[
"Summhammer",
"Johann",
""
]
] |
quant-ph/9708049 | Richard MacKenzie | S. Chaturvedi, R. MacKenzie, P.K. Panigrahi, V. Srinivasan | Equivalence of the grand canonical partition functions of particles with
different statistics | 4 pages | Mod.Phys.Lett. A12 (1997) 1095-1099 | 10.1142/S0217732397001114 | UdeM-GPP-TH-39a | quant-ph | null | It is shown that the grand partition function of an ideal Bose system with
single particle spectrum $\epsilon_i = (2n+k+3/2)\hbar\omega$ is identical to
that of a system of particles with single particle energy $\epsilon_i
=(n+1/2)\hbar\omega$ and obeying a particular kind of statistics based on the
permutation group.
| [
{
"version": "v1",
"created": "Wed, 27 Aug 1997 16:27:13 GMT"
}
] | 2015-06-26T00:00:00 | [
[
"Chaturvedi",
"S.",
""
],
[
"MacKenzie",
"R.",
""
],
[
"Panigrahi",
"P. K.",
""
],
[
"Srinivasan",
"V.",
""
]
] |
quant-ph/9708050 | Daniel F. V. James | R. J. Hughes, D. F. V. James, J. J. Gomez, M. S. Gulley, M. H.
Holzscheiter, P. G. Kwiat, S. K. Lamoreaux, C. G. Peterson, V. D. Sandberg,
M. M. Schauer, C. M. Simmons, C. E. Thorburn, D. Tupa, P. Z. Wang, A. G.
White | The Los Alamos Trapped Ion Quantum Computer Experiment | 41 pages, 16 figures, submitted to Fortschritte der Physik | Fortschritte der Physik 46, 329-362 (1998) | 10.1002/(SICI)1521-3978(199806)46:4/5<329::AID-PROP329>3.0.CO;2-X | LA-UR-97-3301 | quant-ph | null | The development and theory of an experiment to investigate quantum
computation with trapped calcium ions is described. The ion trap, laser and ion
requirements are determined, and the parameters required for quantum logic
operations as well as simple quantum factoring are described.
| [
{
"version": "v1",
"created": "Wed, 27 Aug 1997 23:45:15 GMT"
}
] | 2015-06-26T00:00:00 | [
[
"Hughes",
"R. J.",
""
],
[
"James",
"D. F. V.",
""
],
[
"Gomez",
"J. J.",
""
],
[
"Gulley",
"M. S.",
""
],
[
"Holzscheiter",
"M. H.",
""
],
[
"Kwiat",
"P. G.",
""
],
[
"Lamoreaux",
"S. K.",
""
],
[
"Peterson",
"C. G.",
""
],
[
"Sandberg",
"V. D.",
""
],
[
"Schauer",
"M. M.",
""
],
[
"Simmons",
"C. M.",
""
],
[
"Thorburn",
"C. E.",
""
],
[
"Tupa",
"D.",
""
],
[
"Wang",
"P. Z.",
""
],
[
"White",
"A. G.",
""
]
] |
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