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Using continuous wave superposition of spatial modes, we demonstrateexperimentally displacement measurement of a light beam below the standardquantum limit. Multimode squeezed light is obtained by mixing a vacuum squeezedbeam and a coherent beam that are spatially orthogonal. Although the resultantbeam 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 splitdetector with an increased precision compared to a classical beam. This methodcan be used to improve the sensitivity of small displacement measurements.Comment: 4 pages, 5 figure

Surpassing the Standard Quantum Limit for Optical Imaging Using Nonclassical Multimode Light