Hybrid optomechanical cooling by atomic $\Lambda$ systems

Abstract

We investigate a hybrid quantum system consisting of a cavity optomechanical device optically coupled to an ultracold quantum gas. We show that the dispersive properties of the ultracold gas can be used to dramatically modify the optomechanical response of the mechanical resonator. We examine hybrid schemes wherein the mechanical resonator is coupled either to the motional or the spin degrees of freedom of the ultracold gas. In either case, we find an enhancement of more than two orders of magnitude in optomechanical cooling due to this hybrid interaction. Significantly, based on demonstrated parameters for the cavity optomechanical device, we identify regimes that enable the ground state cooling of the resonator from room temperature. In addition, the hybrid system considered here represents a powerful interface for the use of an ultracold quantum gas for state preparation, sensing and quantum manipulation of a mesoscopic mechanical resonator.

14 pages, 12 figures

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• Long Distance Coupling of a Quantum Mechanical Oscillator to the Internal States of an Atomic Ensemble
• A millikelvin all-fiber cavity optomechanical apparatus for merging with ultra-cold atoms in a hybrid quantum system
• Ground state cooling in a hybrid optomechanical system with a three-level atomic ensemble
• Parametric amplification of light in a cavity with a moving dielectric membrane: Landau-Zener problem for the Maxwell field