TY - JOUR T1 - Optimal entanglement-assisted one-shot classical communication JF - Physical Review A Y1 - 2013 A1 - Hemenway, Brett A1 - Carl Miller A1 - Shi, Yaoyun A1 - Wootters, Mary AB -

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.

VL - 87 U4 - 062301 UR - http://link.aps.org/doi/10.1103/PhysRevA.87.062301 U5 - 10.1103/PhysRevA.87.062301 ER -