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The capacity of the quantum channel with general signal states

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1 Author(s)
Holevo, A.S. ; Steklov Math. Inst., Moscow, Russia

It is shown that the capacity of a classical-quantum channel with arbitrary (possibly mixed) states equals the maximum of the entropy bound with respect to all a priori distributions. This completes the recent result of Hausladen, Jozsa, Schumacher, Westmoreland, and Wootters (1996), who proved the equality for the pure state channel

Published in:

Information Theory, IEEE Transactions on  (Volume:44 ,  Issue: 1 )