双量子比特系统在Ising自旋链环境下的相干性冻结  

Freezing Phenomenon of Quantum Coherence for a Two-qubit System Coupled to Ising Spin Chain

作　　者：杨阳[1] 曹连振[1] 赵加强[1] 逯怀新[1] YANG Yang;CAO Lian-zhen;ZHAO Jia-qiang;LU Huai-xin(Shandong Provincial Key Laboratory of Multi-Photon Entanglement and Manipulation,Department of Physics and Optoelectronic Engineering,Wei fang University,Weifang,Shandong 261061,China)

机构地区：[1]潍坊学院物理与光电工程学院山东省多光子纠缠与操纵实验室

出　　处：《量子光学学报》2018年第3期283-287,共5页Journal of Quantum Optics

基　　金：国家自然科学基金(批准号:11404246);山东省自然科学基金(批准号:ZR2017MF040)

摘　　要：本文研究双量子比特系统与Ising自旋链相耦合时的退相干动力学,解析地推导出相干性的演化规律。我们发现对一类特殊的初态,采用相对熵来度量的双量子比特系统的量子相干性在演化过程中存在冻结现象。同时,在弱耦合的情形下,量子相干性在Ising链的临界点附近存在突变现象。We study the dynamics of a central two-qubit system coupled to an Ising spin and obtain the analytic expression of the quantum coherence for the system.There exists a freezing phenomenon of the relative entropy measure of quantum coherence for a specific class of initial states.We find that the sudden transition for quantum coherence happens near the critical point of Ising chain under weak-coupling case.

关 键 词：量子相干性 Ising自旋链 相对熵相干度量 冻结现象 

分 类 号：O413.2[理学—理论物理]