Implementation of a single-shot receiver for quaternary phase-shift keyed coherent states

Abstract

We experimentally investigate a strategy to discriminate between quaternary phase-shift keyed coherent states based on single-shot measurements that is compatible with high-bandwidth communications. We extend previous theoretical work in single-shot measurements to include critical experimental parameters affecting the performance of practical implementations. Specifically, we investigate how the visibility of the optical displacement operations required in the strategy impacts the achievable discrimination error probability, and identify the experimental requirements to outperform an ideal heterodyne measurement. Our experimental implementation is optimized based on the experimental parameters and allows for the investigation of realistic single-shot measurements for multistate discrimination.

arXiv comment8 pages, 6 figures

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• Optimizing state-discrimination receivers for continuous-variable quantum key distribution over a wiretap channel
• Phase tracking for sub-shot-noise-limited receivers
• Discrimination of thermal baths by single qubit probes
• Beating the standard quantum limit for binary phase-shift-keying discrimination with a realistic hybrid feed-forward receiver
• Determination of the asymptotic limits of adaptive photon counting measurements for coherent-state optical phase estimation
• Demonstration of optimal non-projective measurement of binary coherent states with photon counting
• Low-cost limit of classical communication with restricted quantum measurements
• Quantum communications in continuous variable systems