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ChemPhysChem

Entangling Light in its Spatial Degrees of Freedom with Four‐Wave Mixing in an Atomic Vapor

Vincent Boyer, Alberto M. Marino, Raphael C. Pooser, Paul D. Lett

Published Feb 18, 2009• 11 citations

Abstract

Abstract Nonlinearities in atomic vapors allow the production of “entangled images”—beams of light whose transverse light distributions exhibit localized correlations in their unavoidable quantum fluctuations (see picture). These spatially entangled beams may prove useful to reduce the noise in absorption imaging and beam positioning below the quantum noise level, as well as for quantum information applications. magnified image The entanglement properties of two beams of light can reside in subtle correlations that exist in the unavoidable quantum fluctuations of their amplitudes and phases. Recent advances in the generation of nonclassical light with four‐wave mixing in an atomic vapor have permitted the production and the observation of entanglement that is localized in almost arbitrary transverse regions of a pair of beams. These multi‐spatial‐mode entangled beams may prove useful for an array of applications ranging from noise‐free imaging and improved position sensing to quantum information processing.

DOI: 10.1002/cphc.200800734

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