Auxiliary-cavity-assisted ground-state cooling of an optically levitated nanosphere in the unresolved-sideband regime

Jin-Shan Feng, Lei Tan, Huai-Qiang Gu, and Wu-Ming Liu
Phys. Rev. A 96, 063818 – Published 13 December 2017

Abstract

We theoretically analyze the ground-state cooling of an optically levitated nanosphere in the unresolved-sideband regime by introducing a coupled high-quality-factor cavity. On account of the quantum interference stemming from the presence of the coupled cavity, the spectral density of the optical force exerting on the nanosphere gets changed and then the symmetry between the heating and the cooling processes is broken. Through adjusting the detuning of a strong-dissipative cavity mode, one obtains an enhanced net cooling rate for the nanosphere. It is illustrated that the ground-state cooling can be realized in the unresolved sideband regime even if the effective optomechanical coupling is weaker than the frequency of the nanosphere, which can be understood by the picture that the effective interplay of the nanosphere and the auxiliary cavity mode brings the system back to an effective resolved regime. Besides, the coupled cavity refines the dynamical stability of the system.

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  • Received 2 June 2017
  • Revised 9 September 2017

DOI:https://doi.org/10.1103/PhysRevA.96.063818

©2017 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Atomic, Molecular & Optical

Authors & Affiliations

Jin-Shan Feng1, Lei Tan1,*, Huai-Qiang Gu2, and Wu-Ming Liu3

  • 1Institute of Theoretical Physics, Lanzhou University, Lanzhou 730000, China
  • 2School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
  • 3Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

  • *tanlei@lzu.edu.cn

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Issue

Vol. 96, Iss. 6 — December 2017

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