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Quantum Information Processing
Published in: Quantum Information Processing 7/2018

01-07-2018

Coherence generating power of unitary transformations via probabilistic average

Authors: Lin Zhang, Zhihao Ma, Zhihua Chen, Shao-Ming Fei

Published in: Quantum Information Processing | Issue 7/2018

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Abstract

We study the ability of a quantum channel to generate quantum coherence when it applies to incoherent states. Based on probabilistic averages, we define a measure of such coherence generating power (CGP) for a generic quantum channel, based on the average coherence generated by the quantum channel acting on a uniform ensemble of incoherent states. Explicit analytical formula of the CGP for any unitary channels are presented in terms of subentropy. An upper bound for CGP of unital quantum channels has been also derived. Detailed examples are investigated.
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Appendix
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Metadata
Title
Coherence generating power of unitary transformations via probabilistic average
Authors
Lin Zhang
Zhihao Ma
Zhihua Chen
Shao-Ming Fei
Publication date
01-07-2018
Publisher
Springer US
Published in
Quantum Information Processing / Issue 7/2018
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-018-1928-4

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