2个三能级原子的非平衡热纠缠  

Non-equilibrium thermal entanglement of two three-level atoms

作　　者：孙悦 郭金良 SUN Yue;GUO Jinliang(College of Physics and Materials Science,Tianjin Normal University,Tianjin 300387,China)

机构地区：[1]天津师范大学物理与材料科学学院,天津300387

出　　处：《天津师范大学学报（自然科学版）》2020年第2期12-16,共5页Journal of Tianjin Normal University：Natural Science Edition

基　　金：国家自然科学基金资助项目(11305114);天津市高等学校创新团队资助项目(TD13-5077).

摘　　要：针对高维量子系统的量子关联演化问题,利用纠缠度量negativity对与热库相互作用的一维光晶格中qutrit-qutrit系统的非平衡热纠缠进行研究.采用数值模拟的方法求解qutrit-qutrit系统随时间演化的密度矩阵,计算出qutrit-qutrit系统在不同温度玻色库耦合下的纠缠值,并对温度差ΔT、平均温度T_M、系统初态、非线性耦合系数K和磁场B等参数对纠缠的影响进行分析.结果表明:量子纠缠在随时间演化的过程中会随着ΔT、T_M和B的增大而减小,甚至出现纠缠猝死,但随着K绝对值的增大,纠缠稳定增加.初态的选择会影响纠缠的变化,但不同初态的稳定纠缠值相同.For the problem of quantum correlation evolution of high-dimensional quantum systems,non-equilibrium thermal entanglement of the qutrit-qutrit system in the one-dimensional optical lattice which interacts with a thermal library was studied using entanglement metric negativity. The density matrix of the qutrit-qutrit system with time evolution and the entanglement value of the qutrit-qutrit system under different bose library coupling temperature was solved using numerical simulation method,and the effects of temperature difference ΔT,average temperature T_M,initial state of the system,nonlinear coupling coefficient K,magnetic field B and other parameters on entanglement were analyzed. The results show that the quantum entan-glement decreases with the increase of ΔT,T_M and B in the process of evolution with time,and even entanglement stagnation,but the entanglement can increase steadily with the absolute value of K. The choice of the initial state can affect the change of entan-glement,but the stable entanglement values of different initial states are the same.

关 键 词：量子纠缠 三能级原子 非平衡态 密度矩阵 负度 

分 类 号：O413.1[理学—理论物理]