paper

Surpassing the standard quantum limit for optical imaging using non-classical multimode light

arXiv:quant-ph/0204017 · doi:10.1103/PhysRevLett.88.203601

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.

4 pages, 5 figures

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