Quantum and classical fidelities for Gaussian states

Jeong, Hyunseok, Ralph, Timothy C. and Bowen, Warwick P. (2007) Quantum and classical fidelities for Gaussian states. Journal of The Optical Society of America B - Optical Physics, 24 2: 355-362. doi:10.1364/JOSAB.24.000355

Author Jeong, Hyunseok
Ralph, Timothy C.
Bowen, Warwick P.
Title Quantum and classical fidelities for Gaussian states
Journal name Journal of The Optical Society of America B - Optical Physics   Check publisher's open access policy
ISSN 0740-3224
Publication date 2007-01-26
Year available 2007
Sub-type Article (original research)
DOI 10.1364/JOSAB.24.000355
Volume 24
Issue 2
Start page 355
End page 362
Total pages 8
Editor G. I. Stegeman
Place of publication United States
Publisher Optical Society of America
Language eng
Subject 0203 Classical Physics
240402 Quantum Optics and Lasers
780102 Physical sciences
Abstract We examine the physical significance of fidelity as a measure of similarity for Gaussian states by drawing a comparison with its classical counterpart. We find that the relationship between these classical and quantum fidelities is not straightforward, and in general does not seem to provide insight into the physical significance of quantum fidelity. To avoid this ambiguity we propose that the efficacy of quantum information protocols be characterized by determining their transfer function and then calculating the fidelity achievable for a hypothetical pure reference input state. (c) 2007 Optical Society of America.
Keyword Optics
Squeezed Thermal States
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 03:05:26 EST