The Capacity of the Quantum Channel with General Signal States

  title={The Capacity of the Quantum Channel with General Signal States},
  author={A. Holevo},
  journal={IEEE Trans. Inf. Theory},
  • A. Holevo
  • Published 1998
  • Physics, Computer Science, Mathematics
  • IEEE Trans. Inf. Theory
  • 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. 
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