The Capacity of Quantum Channel with General Signal States

Abstract

It is shown that the capacity of a classical-quantum channel with arbitrary (possibly mixed) states equals to the maximum of the entropy bound with respect to all apriori distributions. This completes the recent result of Hausladen, Jozsa, Schumacher, Westmoreland and Wooters, who proved the equality for the pure state channel.

arXiv comment8 pages, Latex, no figures, to be published in IEEE Trans. Inform. Theory

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