Superiority of entangled measurements over all local strategies for the estimation of product coherent states

J. Nisset, A. Acin, Ulrik Lund Andersen, N.J. Cerf, R. García-Patrón, M. Navascues, M. Sabuncu

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Abstract

It is shown that the ensemble {P(alpha),vertical bar alpha >vertical bar alpha(*)>}, where P(alpha) is a Gaussian distribution of finite variance and |alpha > is a coherent state, can be better discriminated with an entangled measurement than with any local strategy supplemented by classical communication. Although this ensemble consists of products of quasiclassical states without any squeezing, it thus exhibits a purely quantum feature. This remarkable effect is demonstrated experimentally by implementing the optimal local strategy on coherent states of light together with a global strategy that yields a higher fidelity.
Original languageEnglish
JournalPhysical Review Letters
Volume98
Issue number26
Pages (from-to)260404
ISSN0031-9007
DOIs
Publication statusPublished - 2007

Bibliographical note

Copyright 2007 American Physical Society

Keywords

  • QUANTUM INFORMATION

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