Homodyne-like detection for state-discrimination in the presence of phase noise

Abstract

We propose an innovative strategy to discriminate between two coherent states affected by either uniform or gaussian phase noise. The strategy is based on a homodyne-like detection scheme with photon-number-resolving detectors in the regime of low-intensity local oscillator. The experimental implementation of the detection scheme involves two hybrid photodetectors, whose outputs are used in post processing to calculate the shot-by-shot photon-number difference. The performance of this strategy is quantified in terms of the error probability in discriminating the noisy coherent signals as a function of the characteristic noise parameters.

arXiv comment5 pages, 5 figures

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• Homodyne tomography with homodyne-like detection
• Hybrid near-optimum binary receiver with realistic photon-number-resolving detectors
• Detection of squeezing by on-chip glass-integrated homodyne analyzer
• Coherent detection schemes for subcarrier wave continuous variable quantum key distribution
• Implementation of a single-shot receiver for quaternary phase-shift keyed coherent states
• Discrimination of thermal baths by single qubit probes
• Squeezing as a resource to counteract phase diffusion in optical phase estimation
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