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

Abstract

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.

7 pages, 4 figures, published version

References in corpus (4)

• The optimal cloning of quantum coherent states is non-Gaussian
• Demonstration of deterministic and high fidelity squeezing of quantum information
• Binary projective measurement via linear optics and photon counting
• Mutual information--based approach to adaptive homodyne detection of quantum optical states

Cited by in corpus (1)

• Demonstration of near-Optimal Discrimination of Optical Coherent States