Entanglement concentration with strong projective measurement in an optomechanical system  

作　　者：MAIMAITI Wulayimu LI Zhe CHESI Stefano WANG YingDan 

机构地区：[1]State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences [2]Beijing Computational Science Research Center

出　　处：《Science China(Physics,Mechanics & Astronomy)》2015年第5期70-75,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Chinese Youth 1000 Talents Program and the National Natural Science Foundation of China(Grant No.11434011)

摘　　要：In this work, we study an entanglement concentration scheme in a 3-mode optomechanical system. The scheme is based on phonon counting measurements, which can be performed through photon counting of an auxiliary cavity connected to the mechanical resonator. The amount of entanglement between the two cavity output modes is found to increase logarithmically with the number of detected phonons(photons). Such an entanglement concentration scheme is deterministic since, independently of the number of detected phonons(photons), the measurement always leads to an increase in output entanglement. Besides numerical simulations,we provide analytical results and physical insight for the improved entanglement and the concentration efficiency.In this work, we study an entanglement concentration scheme in a 3-mode optomechanical system. The scheme is based on phonon counting measurements, which can be performed through photon counting of an auxiliary cavity connected to the mechanical resonator. The amount of entanglement between the two cavity output modes is found to increase logarithmically with the number of detected phonons （photons）. Such an entanglement concentration scheme is deterministic since, independently of the number of detected phonons （photons）, the measurement always leads to an increase in output entanglement. Besides numerical simulations, we provide analytical results and physical insight for the improved entanglement and the concentration efficiency.

关 键 词：OPTOMECHANICS entanglement concentration quantum measurement optomechanical entanglement 

分 类 号：O431.2[机械工程—光学工程]