XXX模型在与时间有关的任意外场下量子态的纠缠测度  

The concurrence of quantum states of XXX models in a time-dependent arbitrary external field

作　　者：程继文[1] 朱钦圣[1] 邝小渝[1] 张仕勋[1] 

机构地区：[1]四川大学原子与分子物理研究所,成都610065

出　　处：《四川大学学报（自然科学版）》2008年第2期357-362,共6页Journal of Sichuan University(Natural Science Edition)

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

摘　　要：基于代数动力学和纠缠测度的基本概念,研究了时间相关的任意外场驱动的海森堡XXX-模型下的双量子比特纠缠态随时间演化的性质.可以证明,纠缠测度仅仅由耦合常量和外场的强度决定的.通过进一步研究发现,在任意恒定外场的驱动下,热域纠缠测度是一个与耦合常量J,温度T以及外场大小有关的函数.Based on algebraic dynamics and the concept of the concurrence of the entanglement, we investigate the evolutive properties of the Two-Qubit entanglement that formed by Heisenberg XXX models under a time-dependent arbitrary external field. For this system, the property of the concurrence that is only dependent on the coupling constant J and total values of the external field is proved. Furthermore, we found that the thermal concurrence of the system under a static arbitrary external field is a function of the coupling constant J, temperature T and the magnitude of external field.

关 键 词：纠缠测度 代数动力学 纠缠 

分 类 号：O411[理学—理论物理]