Enhancing photon entanglement in a three-mode optomechanical system via imperfect phonon measurements  

作　　者：Jing Qiu Dongni Chen Ying-Dan Wang Stefano Chesi 

机构地区：[1]Beijing Computational Science Research Center,Beijing 100193,China [2]CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,P O Box2735,Beijing,100190 [3]School of Physical Sciences,University of Chinese Academy of Sciences,No.19A Yuquan Road Beijing 100049,China [4]Department of Physics,Beijing Normal University,Beijing 100875 China

出　　处：《Communications in Theoretical Physics》2022年第5期51-60,共10页理论物理通讯（英文版）

基　　金：support from NSFC(Grants No.11974040 and No.12150610464);NSAF(Grant No.U1930402);support from MOST(Grant No.2017YFA0304503)。

摘　　要：By considering a 3-mode optomechanical system formed by two cavities interacting with a common mechanical mode,we demonstrate that phonon-counting measurements lead to a significant enhancement of entanglement in the output of the two cavities.This conclusion still holds for an inefficient detector,but the dependence on system parameters changes qualitatively from the ideal limit of perfect projective measurements.We find non-trivial optimal points for the entanglement as functions of detector efficiency,measurement outcome,and optical drive strengths.We characterize both the highest achievable entanglement as well as a‘typical’value,obtained at the most likely measurement outcome.Numerical results are well understood within an approximate analytical approach based on perturbation theory around the ideal detector limit.

关 键 词：optomechanical system entanglement concentration imperfect phonon measurements maximum entanglement typical entanglement 

分 类 号：O43[机械工程—光学工程]