We propose a hybrid feed-forward receiver (HFFRE) for the discrimination of
binary phase-shift-keyed coherent states based on the appropriate combination
of the displacement feed-forward receiver (DFFRE) and a homodyne-like setup
employing a low-intensity local oscillator and photon-number-resolving
detectors. We investigate the performance of the proposed scheme addressing
also realistic scenarios in the presence of non-unit quantum detection
efficiency, dark counts and a visibility reduction. The present HFFRE
outperforms the DFFRE in all conditions, beating the standard quantum limit in
particular regimes.Comment: 10 pages, 10 figure