Beating the standard quantum limit for binary phase-shift-keying discrimination with a realistic hybrid feed-forward receiver

• URL: http://arxiv.org/abs/2308.04146v2
• Date: Wed, 25 Oct 2023 09:09:34 GMT
• Title: Beating the standard quantum limit for binary phase-shift-keying discrimination with a realistic hybrid feed-forward receiver
• Authors: Michele N. Notarnicola and Stefano Olivares
• Abstract summary: We propose a hybrid feed-forward receiver (HFFRE) for the discrimination of binary phase-shift-keyed coherent states. We investigate the performance of the proposed scheme, also addressing realistic scenarios in the presence of nonunit quantum detection efficiency, dark counts, and visibility reduction. The present HFFRE outperforms the DFFRE in all conditions, beating the standard quantum limit in particular regimes.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a hybrid feed-forward receiver (HFFRE) for the discrimination of binary phase-shift-keyed coherent states based on the appropriate combination of a displacement feed-forward receiver (DFFRE) and a homodynelike setup employing a low-intensity local oscillator and photon-number-resolving detectors. We investigate the performance of the proposed scheme, also addressing realistic scenarios in the presence of nonunit quantum detection efficiency, dark counts, and visibility reduction. The present HFFRE outperforms the DFFRE in all conditions, beating the standard quantum limit in particular regimes.

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