Discrimination of binary coherent states using a homodyne detector and a photon number resolving detector

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

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)

Abstract

We investigate quantum measurement strategies capable of discriminating two coherent states probabilistically with significantly smaller error probabilities than can be obtained using nonprobabilistic state discrimination. We apply a postselection strategy to the measurement data of a homodyne detector as well as a photon number resolving detector in order to lower the error probability. We compare the two different receivers with an optimal intermediate measurement scheme where the error rate is minimized for a fixed rate of inconclusive results. The photon number resolving (PNR) receiver is experimentally demonstrated and compared to an experimental realization of a homodyne receiver with postselection. In the comparison, it becomes clear that the performance of the PNR receiver surpasses the performance of the homodyne receiver, which we prove to be optimal within any Gaussian operations and conditional dynamics.

Original languageEnglish
Article number062338
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume81
Issue number6
DOIs
Publication statusPublished - 2010 Jun 25
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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