Atom assisted cavity cooling of a micromechanical oscillator in the unresolved sideband regime

[摘要] The ground state cooling of a mechanical oscillator in an optomechanical cavity containing an ensemble of identical two-level ground-state atoms is studied in the highly unresolved-sideband regime. The system exhibits electromagnetically-induced transparencylike quantum interference effect. The mutual interaction with the cavity optical field gives rise to an indirect coupling between the atomic and mechanical modes. In presence of this interaction, the noise spectrum gets modified and leads to asymmetric cooling and heating rates. Using the quantum master equation, time evolution of the average phonon number is studied and it is observed that the average phonon occupancy in the mechanical resonator exhibits ground-state cooling.

[发布机构] Department of Physics, Indian Institute of Technology Guwahati, Guwahati; Assam; 781039, India^1

[效力级别] 计算机科学 [学科分类] 计算机科学（综合）

[关键词] Ground state cooling;Ground-state atoms;Mechanical oscillators;Mechanical resonators;Micromechanical oscillators;Optomechanical cavities;Quantum interference effects;Quantum master equations