Information transmission through a noisy quantum channel

  title={Information transmission through a noisy quantum channel},
  author={Howard Barnum and Michael A. Nielsen and Benjamin Schumacher},
  journal={Physical Review A},
Noisy quantum channels may be used in many information-carrying applications. We show that different applications may result in different channel capacities. Upper bounds on several of these capacities are proved. These bounds are based on the coherent information, which plays a role in quantum information theory analogous to that played by the mutual information in classical information theory. Many new properties of the coherent information and entanglement fidelity are proved. Two… 

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