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

C. Wittmann, Ulrik Lund Andersen, M. Takeoka, D. Sych, G. Leuchs

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Abstract

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, 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.
Original languageEnglish
JournalPhysical Review Letters
Volume104
Issue number10
Pages (from-to)100505
ISSN0031-9007
DOIs
Publication statusPublished - 2010

Bibliographical note

Copyright 2010 American Physical Society

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