%0 Journal Article %J Physical Review A %D 2013 %T Optimal entanglement-assisted one-shot classical communication %A Hemenway, Brett %A Carl Miller %A Shi, Yaoyun %A Wootters, Mary %X

The one-shot success probability of a noisy classical channel for transmitting one classical bit is the optimal probability with which the bit can be successfully sent via a single use of the channel. Prevedel et al. [Phys. Rev. Lett. 106, 110505 (2011)] recently showed that for a specific channel, this quantity can be increased if the parties using the channel share an entangled quantum state. In this paper, we characterize the optimal entanglement-assisted protocols in terms of the radius of a set of operators associated with the channel. This characterization can be used to construct optimal entanglement-assisted protocols for a given classical channel and to prove the limits of such protocols. As an example, we show that the Prevedel et al. protocol is optimal for two-qubit entanglement. We also prove some tight upper bounds on the improvement that can be obtained from quantum and nonsignaling correlations.

%B Physical Review A %V 87 %P 062301 %8 2013/06/03 %G eng %U http://link.aps.org/doi/10.1103/PhysRevA.87.062301 %R 10.1103/PhysRevA.87.062301