Hybrid near-optimum binary receiver with realistic photon-number-resolving detectors

Abstract

We propose a near-optimum receiver for the discrimination of binary phase-shift-keyed coherent states employing photon-number-resolving detectors. The receiver exploits a discrimination strategy based on both the so-called homodyne-like and the direct detection, thus resulting in a hybrid scheme. We analyse the performance and the robustness of the proposed scheme under realistic conditions, namely, in the presence of inefficient detection and dark counts. We show that the present hybrid setup is near-optimum and beats both the standard-quantum-limit and the performance of the Kennedy receiver.

arXiv comment20 pages, 6 figures

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• An introductory review of the theory of continuous-variable quantum key distribution: Fundamentals, protocols, and security
• Linearly Multiplexed Photon Number Resolving Single-photon Detectors Array
• On the application of a Silicon photomultiplier-based receiver for binary phase-shift-keying protocols
• Quantum communications in continuous variable systems
• Near-optimal coherent state discrimination via continuously labelled non-Gaussian measurements