Entanglement-Enhanced Classical Communication Over a Noisy Classical Channel (original) (raw)

2011, Physical Review Letters

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 AE 0:002, which is close to the theoretical maximum of ð2 þ 2 À1=2 Þ=3 % 0:902 and is significantly above the optimal classical strategy, which yields 5=6 % 0:833.

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