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Entanglement-enhanced classical capacity of quantum communication channels with correlated noise in arbitrary dimensions

par Karpov, Evgueni ;Daems, David ;Cerf, Nicolas
Référence Physical review. A, Atomic, Molecular, and Optical Physics, 74, 032320
Publication Publié, 2006-09-19

Article révisé par les pairs

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Résumé :

We study the capacity of d-dimensional quantum channels with memory modeled by correlated noise. Weshow that, in agreement with previous results on Pauli qubit channels, there are situations where maximallyentangled input states achieve higher values of mutual information than product states. Moreover, a strongdependence of this effect on the nature of the noise correlations as well as on the parity of the space dimensionis found. We conjecture that when entanglement gives an advantage in terms of mutual information, maximallyentangled states saturate the channel capacity.