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Journal

2013 | 11 | 1 | 69-77

Article title

Notes on entropic characteristics of quantum channels

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EN

Abstracts

EN
One of most important issues in quantum information theory concerns transmission of information through noisy quantum channels. We discuss a few channel characteristics expressed by means of generalized entropies. Such characteristics can often be treated in line with more usual treatment based on the von Neumann entropies. For any channel, we show that the q-average output entropy of degree q ≥ 1 is bounded from above by the q-entropy of the input density matrix. The concavity properties of the (q, s)-entropy exchange are considered. Fano type quantum bounds on the (q, s)-entropy exchange are derived. We also give upper bounds on the map (q, s)-entropies in terms of the output entropy, corresponding to the completely mixed input.

Publisher

Journal

Year

Volume

11

Issue

1

Pages

69-77

Physical description

Dates

published
1 - 1 - 2013
online
15 - 1 - 2013

Contributors

  • Department of Theoretical Physics, Irkutsk State University Irkutsk, Gagarin Bv. 20, 664003, Irkutsk, Russia

References

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Document Type

Publication order reference

Identifiers

YADDA identifier

bwmeta1.element.-psjd-doi-10_2478_s11534-012-0134-8
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