Discrimination of Optical Coherent States using a Photon Number Resolving Detector

Abstract

The discrimination of non-orthogonal quantum states with reduced or without errors is a fundamental task in quantum measurement theory. In this work, we investigate a quantum measurement strategy capable of discriminating two coherent states probabilistically with significantly smaller error probabilities than can be obtained using non-probabilistic state discrimination. We find that appropriate postselection of the measurement data of a photon number resolving detector can be used to discriminate two coherent states with small error probability. We compare our new receiver to an optimal intermediate measurement between minimum error discrimination and unambiguous state discrimination.

5 pages, 4 figures

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• Discrimination of binary coherent states using a homodyne detector and a photon number resolving detector
• Robust Measurement for the Discrimination of Binary Coherent States
• Optimal receiver for binary coherent signals
• Optimized communication strategies with binary coherent states over phase noise channels
• Macroscopic State Interferometry Over Large Distances Using State Discrimination
• Near optimal discrimination of binary coherent signals via atom-light interaction
• Phase tracking for sub-shot-noise-limited receivers
• Quantum communications in continuous variable systems
• Discrimination of Coherent States via Atom-Field Interaction without Rotation Wave Approximation