Double-passage mechanical cooling in a coupled optomechanical system  

作　　者：Qing-Xia Mu Chao Lang Wen-Zhao Zhang 穆青霞;郎潮;张闻钊(Mathematics and Physics Department,North China Electric Power University,Beijing 102206,China;Beijing Computational Science Research Center(CSRC),Beijing 100193,China)

机构地区：[1]Mathematics and Physics Department,North China Electric Power University,Beijing 102206,China [2]Beijing Computational Science Research Center(CSRC),Beijing 100193,China

出　　处：《Chinese Physics B》2019年第11期173-178,共6页中国物理B（英文版）

基　　金：Project supported by the Fundamental Research Funds for the Central Universities,China(Grant No.2018MS056);the National Natural Science Foundation of China(Grant Nos.11605055 and 11574082)

摘　　要：We consider a three-mode optomechanical system where two cavity modes are coupled to a common mechanical oscillator. We focus on the resolved sideband limit and illustrate the relation between the significant parameters of the system and the instantaneous-state mean phonon number of the oscillator cooled to the ground state, particularly at the early stage of the evolution. It is worth noting that the optical coupling sets up a correlation between the two cavity modes,which has significant effect on the cooling process. Using numerical solutions, we find that the inter-cavity coupling will decrease the cooling effect when both cavities have the same effective optomechanical coupling. However, when the effective optomechanical couplings are different, the cooling effect will be strongly improved by selecting appropriate range of inter-cavity coupling.We consider a three-mode optomechanical system where two cavity modes are coupled to a common mechanical oscillator. We focus on the resolved sideband limit and illustrate the relation between the significant parameters of the system and the instantaneous-state mean phonon number of the oscillator cooled to the ground state, particularly at the early stage of the evolution. It is worth noting that the optical coupling sets up a correlation between the two cavity modes,which has significant effect on the cooling process. Using numerical solutions, we find that the inter-cavity coupling will decrease the cooling effect when both cavities have the same effective optomechanical coupling. However, when the effective optomechanical couplings are different, the cooling effect will be strongly improved by selecting appropriate range of inter-cavity coupling.

关 键 词：optomechanical system GROUND-STATE COOLING QUANTUM OPTICS 

分 类 号：O41[理学—理论物理]