Realizable receivers for discriminating coherent and multicopy quantum states near the quantum limit

Ranjith Nair, Saikat Guha, Si Hui Tan

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

We derive the quantum limit on the error probability exponent for discriminating any M multimode coherent states of light and show that it is four times that of an ideal heterodyne receiver for the same signal set. We then propose a receiver that achieves the quantum limit using auxiliary coherent-state fields, beam splitters, and single-photon detectors. The performance of the receiver is compared to standard measurements for various imaging and communication tasks. A related receiver for discriminating arbitrary multicopy pure quantum states is shown to achieve the M-ary quantum Chernoff exponent and does so using only local operations and classical communication.

Original languageEnglish (US)
Article number032318
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume89
Issue number3
DOIs
StatePublished - Mar 12 2014
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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