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Abstract: The work is devoted to study of quantum mutual information and coherentinformation - the two important characteristics of quantum communicationchannel. Appropriate definitions of these quantities in theinfinite-dimensional case are given and their properties are studied in detail.Basic identities relating quantum mutual information and coherent informationof a pair of complementary channels are proved. An unexpected continuityproperty of quantum mutual information and coherent information following fromthe above identities is observed. An upper bound for the coherent informationis obtained.



Autor: A.S.Holevo, M.E.Shirokov

Fuente: https://arxiv.org/







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