Protection of entanglement between two V-atoms in a multi-cavity coupling system  

作　　者：Wen-Jin Huang Mao-Fa Fang Xiong Xu 黄文进;方卯发;许雄(Synergetic Innovation Center for Quantum Effects and Applications,Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education,School of Physics and Electronics,Hunan Normal University,Changsha 410081,China;School of Physics and Electronics,Hunan Key Laboratory of Super Microstructure and Ultrafast Process,State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]Synergetic Innovation Center for Quantum Effects and Applications,Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education,School of Physics and Electronics,Hunan Normal University,Changsha 410081,China [2]School of Physics and Electronics,Hunan Key Laboratory of Super Microstructure and Ultrafast Process,State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China

出　　处：《Chinese Physics B》2022年第1期124-129,共6页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.12064012 and 11374096).

摘　　要：The protection of the entanglement between two V-atoms(EBTVA)in a multi-cavity coupling system is studied.The whole system consists of two V-atoms.The two V-atoms are initially in the maximum entangled state and interacts locally with its own dissipative cavity which is coupled to the external cavities with high quality factor(ECWHQF).The results show that,when there is no ECWHQF,the EBTVA can be protected effectively in the case where the V-atom and the dissipative cavity are weak coupled in large detuning,while when there are different numbers n of ECWHQF coupled to two dissipative cavities,by adjusting the parameters of the number n of ECWHQF and the coupling strength k between cavities,the EBTVA can be protected perfectly and continuously.Our result provides an effective method for protecting entanglement resources of three-level system.

关 键 词：V-atom multi-cavity coupling system ENTANGLEMENT NEGATIVITY 

分 类 号：O413[理学—理论物理] O562[理学—物理]