Coherent state discrimination (Physical Review Letters)

Friday 03 Feb 12

Our work on "Demonstration of Coherent-State Discrimination Using a Displacement-Controlled" has been published in Physical Review Letters



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-numberresolving detector, and we show that it outperforms the standard homodyne detector which we, in addition, prove 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.