John A. Smolin, Graeme Smith, et al.
Physical Review Letters
Prior entanglement between sender and receiver, which exactly doubles the classical capacity of a noiseless quantum channel, can increase the classical capacity of some noisy quantum channels by an arbitrarily large constant factor depending on the channel, relative to the best known classical capacity achievable without entanglement. The enhancement factor is greatest for very noisy channels, with positive classical capacity but zero quantum capacity. We obtain exact expressions for the entanglement-assisted capacity of depolarizing and erasure channels in d dimensions. 1999 © The American Physical Society.
John A. Smolin, Graeme Smith, et al.
Physical Review Letters
John A. Smolin, Graeme Smith
Frontiers in Physics
Charles H. Bennett, Gilles Brassard, et al.
Natural Computing
Charles H. Bennett, Gilles Brassard, et al.
Journal of Modern Optics