One-shot entanglement-assisted quantum and classical communication

Details One-shot entanglement-assisted quantum and classical communication One-shot entanglement-assisted quantum and classical communication

2011-05-17

arxiv.org/abs/1105.3321v2

Physics

Quantum Physics

10 pages, 2 figures. Title changed due to new results on the one-shot entanglement-assisted quantum communication. In addition

Scientific paper

We study entanglement-assisted quantum and classical communication over a single use of a quantum channel, which itself can correspond to a finite number of uses of a channel with arbitrarily correlated noise. We obtain characterizations of the corresponding one-shot capacities by establishing upper and lower bounds on them in terms of the difference of two smoothed entropic quantities. In the case of a memoryless channel, the upper and lower bounds converge to the known single-letter formulas for the corresponding capacities, in the limit of asymptotically many uses of it. Our results imply that the difference of two smoothed entropic quantities characterizing the one-shot entanglement-assisted capacities serves as a one-shot analogue of the mutual information, since it reduces to the mutual information, between the output of the channel and a system purifying its input, in the asymptotic, memoryless scenario.

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