Demonstration of Coherent State Discrimination Using a Displacement Controlled Photon Number Resolving Detector

Details Demonstration of Coherent State Discrimination Using a Displacement Controlled Photon Number Resolving Detector Demonstration of Coherent State Discrimination Using a Displacement Controlled Photon Number Resolving Detector

2009-06-16

arxiv.org/abs/0906.2859v2

Physics

Quantum Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.104.100505

We experimentally demonstrate a new measurement scheme for the discrimination of two coherent states. The measurement scheme is based on a displacement operation followed by a photon number resolving detector, and we show that it outperforms the standard homodyne detector which we, in addition, proof to be optimal within all Gaussian operations including conditional dynamics. We also show that the non-Gaussian detector is superior to the homodyne detector in a continuous variable quantum key distribution scheme.

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