一维倾斜场伊辛模型中的纠缠特性  

Properties of entanglement in one-dimensional Ising model with a tilted magnetic field

作　　者：王琪[1] 王晓茜[1] 

机构地区：[1]长春理工大学理学院,长春130022

出　　处：《物理学报》2013年第22期10-15,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11247260;11305020)资助的课题~~

摘　　要：在一维倾斜场伊辛模型中,利用并发度和Q测量函数分别对系统的两体纠缠和整体纠缠进行度量,通过讨论系统中量子纠缠的动力学特性,能够体现出系统的可积和不可积行为.由系统基态的纠缠特性可以发现只要倾角不为零时,系统的Q测量函数会随着磁场的增大而减少,而用并发度刻画的系统的相变特性,随着磁场倾角的增大发生了变化.考虑系统的动力学行为发现,在一维倾斜场伊辛模型中,不可积性会抑制两体纠缠,却促进系统整体纠缠生成.We study the entanglement properties in a one-dimensional Ising chain with a tilted magnetic field that is capable of showing both integrable and nonintegrable behaviors. Here the pairwise entanglement is characterized by concurrence and the multipartite entanglement is characterized by the Q measure. According to the entanglement properties of the ground state in the Ising mode, which have tilt angle, we can find that the Q measure decreases with the increasing of the strength of external field. And the phase transition property of the system is changed with the increase of tilt angle for the external magnetic field. We also consider the evolution of entanglement in this model, and find that the nonintegrability can suppress the pairwise entanglement but promotes the multipartite entanglement with the integrable system.

关 键 词：伊辛模型 不可积性 两体纠缠 整体纠缠 

分 类 号：O431.2[机械工程—光学工程]