The capacity of the quantum channel with general signal states

  • Authors:
  • A. S. Holevo

  • Affiliations:
  • Steklov Math. Inst., Moscow

  • Venue:
  • IEEE Transactions on Information Theory
  • Year:
  • 2006

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Abstract

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