含时旋转磁场中的两耦合粒子的纠缠演化(英文)  

Entanglement evolution of two-coupled spins in a time-dependent rotating magnetic field

作　　者：张仕勋[1] 邝小渝[1] 朱钦圣[1] 程继文[1] 

机构地区：[1]四川大学原子分子物理研究所,成都610065

出　　处：《原子与分子物理学报》2008年第2期293-298,共6页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(10374068);教育部博士点基金(20050610011)

摘　　要：我们研究了含时旋转磁场中海森堡XXX模型下的双量子比特的动力学演化情况.基于此非自治系统的代数结构,我们用代数动力学方法求得了系统的精确解析解.在此基础上,进一步研究了在不同初态下系统的纠缠测度随时间的演化,发现纠缠测度由系统的初态的系数和耦合强度决定.We study the dynamics evolution of a two-qubit Heisenberg XXX spin chain under a time-dependent rotating magnetic field.Based on the algebraic structure of the non-autonomouse system,the exact solution of the Schrdinger equation is obtained by using the method of algebraic dynamics.Based on the time-dependent analytical solution,we further study the entanglement evolution between the two coupled spins for different initial states,and find that the entanglement is determined by the coefficients of the initial state and the coupling constant J of the system.

关 键 词：纠缠演化 代数动力学 非自治系统 

分 类 号：O411[理学—理论物理]