Demonstration of coherent-state discrimination using a displacement- controlled photon-number-resolving detector

Christoffer Wittmann, Ulrik L. Andersen, Masahiro Takeoka, Denis Sych, Gerd Leuchs

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

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
Article number100505
JournalPhysical review letters
Volume104
Issue number10
DOIs
Publication statusPublished - 2010 Mar 12
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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