Surpassing the standard quantum limit for optical imaging using nonclassical multimode light

N. Treps, Ulrik Lund Andersen, B. Buchler, P.K. Lam, A. Maitre, H.A. Bachor, C. Fabre

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Abstract

Using continuous wave superposition of spatial modes, we demonstrate experimentally displacement measurement of a light beam below the standard quantum limit. Multimode squeezed light is obtained by mixing a vacuum squeezed beam and a coherent beam that are spatially orthogonal. Although the resultant beam is not squeezed, it is shown to have strong internal spatial correlations. We show that the position of such a light beam can be measured using a split detector with an increased precision compared to a classical beam. This method can be used to improve the sensitivity of small displacement measurements.
Original languageEnglish
JournalPhysical Review Letters
Volume88
Issue number20
Pages (from-to)203601
ISSN0031-9007
DOIs
Publication statusPublished - 2002

Bibliographical note

Copyright 2002 American Physical Society

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