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2013 | 11 | 1 | 69-77
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Notes on entropic characteristics of quantum channels

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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.
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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, rast@api.isu.ru
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Document Type
Publication order reference
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YADDA identifier
bwmeta1.element.-psjd-doi-10_2478_s11534-012-0134-8
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