Superiority of Entangled Measurements over All Local Strategies for the Estimation of Product Coherent States

J. Niset, A. Acín, U. L. Andersen, N. J. Cerf, Raul Garcia-Patron Sanchez, M. Navascués, M. Sabuncu

Research output: Contribution to journalArticlepeer-review

Abstract

It is shown that the ensemble {P(α), |α⟩|α*⟩} , where P(α) is a Gaussian distribution of finite variance and |α⟩ 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
Article number260404
Number of pages4
JournalPhysical Review Letters
Volume98
Issue number26
DOIs
Publication statusPublished - 26 Jun 2007

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