The Capacity of the Quantum Channel with General Signal States

@article{Holevo1998TheCO,
  title={The Capacity of the Quantum Channel with General Signal States},
  author={Alexander S. Holevo},
  journal={IEEE Trans. Information Theory},
  year={1998},
  volume={44},
  pages={269-273}
}
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, who proved the equality for the pure state channel. 
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