Entanglement and non-Markovianity of a spin-S system in a dephasing environment  

作　　者：范子龙 田晶 曾浩生 

机构地区：[1]Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education,and Department of Physics, Hunan Normal University

出　　处：《Chinese Physics B》2014年第6期30-36,共7页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11275064 and 11075050);the Specialized Research Fund for the Doctoral Program of Higher Education of China(Grant No.20124306110003);the Program for Changjiang Scholars and Innovative Research Team in Universities of China(Grant No.IRT0964);the Construct Program of the National Key Discipline

摘　　要：We study the entanglement （measured by negativity） evolution and the non-Markovianity for the dynamical process of a spin-S system embedded in dephasing environments. The exact analytical solution is presented, which shows that the decoherence function governs the evolutions of coherence, entanglement, and the non-Markovianity of the correspond- ing dynamical processes. For Ohmic and sub-Ohmic reservoirs, the negativity decreases monotonically in time and the corresponding dynamics is Markovian. While for super-Ohmic reservoirs with non-monotonic decoherence function, the negativity appears as the phenomenon of revival and the corresponding dynamics is non-Markovian. The relation between non-Markovianity and the system dimension is studied.We study the entanglement （measured by negativity） evolution and the non-Markovianity for the dynamical process of a spin-S system embedded in dephasing environments. The exact analytical solution is presented, which shows that the decoherence function governs the evolutions of coherence, entanglement, and the non-Markovianity of the correspond- ing dynamical processes. For Ohmic and sub-Ohmic reservoirs, the negativity decreases monotonically in time and the corresponding dynamics is Markovian. While for super-Ohmic reservoirs with non-monotonic decoherence function, the negativity appears as the phenomenon of revival and the corresponding dynamics is non-Markovian. The relation between non-Markovianity and the system dimension is studied.

关 键 词：ENTANGLEMENT non-Markovianity spin-S system DEPHASING 

分 类 号：O413[理学—理论物理] N94[理学—物理]