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.
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|Publication status||Published - 2008 Aug 13|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics