Effect of entanglement embedded in environment on quantum non-Markovianity based on collision model  

作　　者：Xiao-Ming Li Yong-Xu Chen Yun-Jie Xia Zhong-Xiao Man 李晓明;陈勇旭;夏云杰;满忠晓(School of Physics and Physical Engineering,Shandong Provincial Key Laboratory of Laser Polarization and Information Technology,Qufu Normal University,Qufu,273165,China)

机构地区：[1]School of Physics and Physical Engineering,Shandong Provincial Key Laboratory of Laser Polarization and Information Technology,Qufu Normal University,Qufu,273165,China

出　　处：《Communications in Theoretical Physics》2021年第5期46-53,共8页理论物理通讯（英文版）

基　　金：supported by National Natural Science Foundation(China)under Grant No.61675115 and No.11974209;Taishan Scholar Project of Shandong Province(China)under Grant No.tsqn201812059;Shandong Provincial Natural Science Foundation(China)under Grant No.ZR2016JL005。

摘　　要：By means of collision models(CMs)where the environment is simulated by a collection of ancillas consisting of two entangled qubits,we investigate the effects of entanglement in the environment on the non-Markovianity of an open quantum system.Two CMs are considered in this study,in the first one the open quantum system S directly collides with the environment,while in the second one the system interacts with two intermediate qubits which,in turn,are coupled to the environment.We show that it is possible to enhance the non-Markovianity by environment entanglement in both models.In particular,in the second model,we show that the initial state of the auxiliary qubits can also affect the non-Markovianity of the system and there exists the optimal combination of the initial environmental state and the initial state of auxiliary qubits.In this case,the non-Markovianity can be greatly enhanced.

关 键 词：collision model ENTANGLEMENT non-Markovianity 

分 类 号：O413[理学—理论物理]