Discrimination of the binary coherent signal: Gaussian-operation limit and simple non-Gaussian near-optimal receivers

Details Discrimination of the binary coherent signal: Gaussian-operation limit and simple non-Gaussian near-optimal receivers Discrimination of the binary coherent signal: Gaussian-operation limit and simple non-Gaussian near-optimal receivers

2007-06-07

arxiv.org/abs/0706.1038v3

Phys. Rev. A 78, 022320 (2008)

Physics

Quantum Physics

7 pages, 4 figures, published version

Scientific paper

10.1103/PhysRevA.78.022320

We address the limit of the Gaussian operations and classical communication in the problem of quantum state discrimination. We show that the optimal Gaussian strategy for the discrimination of the binary phase shift keyed (BPSK) coherent signal is a simple homodyne detection. We also propose practical near-optimal quantum receivers that beat the BPSK homodyne limit in all areas of the signal power. Our scheme is simple and does not require realtime electrical feedback.

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