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Phys Rev Lett. 2010 Sep 24;105(13):133602. Epub 2010 Sep 22.

Tunable cavity optomechanics with ultracold atoms.

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1
Department of Physics, University of California, Berkeley California 94720, USA.

Abstract

We present an atom-chip-based realization of quantum cavity optomechanics with cold atoms localized within a Fabry-Perot cavity. Effective subwavelength positioning of the atomic ensemble allows for tuning the linear and quadratic optomechanical coupling parameters, varying the sensitivity to the displacement and strain of a compressible gaseous medium. We observe effects of such tuning on cavity optical nonlinearity and optomechanical frequency shifts, providing their first characterization in the quadratic-coupling regime.

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