In this paper we give a sufficient condition for additivity of the minimum output entropy for a pair of given channels and an analytic verification of this condition for specific quantum channels breaking a closely related multiplicativity property [1, 2]. This yields validity of the additivity conjecture for these channels, a result obtained by a different method in . Our proof relies heavily upon certain concavity properties of the output entropy, which are of independent interest.
Problems of Information Transmission – Springer Journals
Published: Jul 15, 2005
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