title: Entanglement-enhanced classical communication over a noisy classical channel.
abstract: We present and experimentally demonstrate a communication protocol that employs shared entanglement to reduce errors when sending a bit over a particular noisy classical channel. Specifically, it is shown that given a single use of this channel, one can transmit a bit with higher success probability when the sender and receiver share entanglement compared to the best possible strategy when they do not. The experiment is realized using polarization-entangled photon pairs, whose quantum correlations play a critical role in both the encoding and decoding of the classical message. Experimentally, we find that a bit can be successfully transmitted with probability 0.891±0.002, which is close to the theoretical maximum of (2+2(-1/2))/3≈0.902 and is significantly above the optimal classical strategy, which yields 5/6≈0.833.
authors.affiliation: Institute for Quantum Computing, University of Waterloo, Waterloo, N2L 3G1, ON, Canada. robert.prevedel@iqc.ca
authors.forename: R
authors.initials: R
authors.lastname: Prevedel
authors.forename: Y
authors.initials: Y
authors.lastname: Lu
authors.forename: W
authors.initials: W
authors.lastname: Matthews
authors.forename: R
authors.initials: R
authors.lastname: Kaltenbaek
authors.forename: K J
authors.initials: KJ
authors.lastname: Resch