共同玻色库中五比特自旋链体系相干性和能流的非马尔可夫动力学演化  

Non-Markovian Dynamical Evolution of Coherence and Energy Flow in Five-Qubit Spin Chain System in a Common Bosonic Bath

作　　者：阿达来提·依比 阿曼妮萨·阿卜杜瓦伊提 张云鹏 袁舜 艾合买提·阿不力孜[1] Adalat Yibi;Amannisa Abdiwayit;Zhang Yunpeng;Yuan Shun;Ahmad Abliz(School of Physics and Electronic Engineering,Xinjiang Normal University,Urumqi 830054,Xinjiang,China)

机构地区：[1]新疆师范大学物理与电子工程学院,新疆乌鲁木齐830054

出　　处：《激光与光电子学进展》2024年第23期396-402,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(11864042)。

摘　　要：伴随系统与其环境之间热交换引起的非平衡效应在量子信息处理任务中有举足轻重的作用。由于任何量子系统都会与周围环境发生信息和能量的交换,从而引起相干性的衰减和能量的转移。采用非马尔可夫量子态扩散方法研究在热平衡态下五量子比特海森堡XXX自旋链体系的相干性和能流的动力学演化特性。讨论该体系耦合到共同的一个非马尔可夫玻色库时的情形,并引入伪纯态作为系统动力学演化的初始态,分别分析和讨论环境记忆效应、噪声强度、温度及磁场强度对量子相干性和能流的影响。数值模拟结果显示,当环境关联系数增大时,系统的相干性会增强,能流借助非马尔可夫记忆效应能够从环境回流到系统。The non-equilibrium effects induced by the energy flow that accompanies heat exchange between the system and its environment play a pivotal role in quantum information processing tasks.The information and energy that a quantum system exchange with its surroundings cause coherence decay and energy transfer.In this study,we used the non-Markovian quantum state diffusion method to study the dynamical evolution properties of coherence and energy flow in a five-qubit Heisenberg XXX spin chain system at thermal equilibrium.We examined the case in which the system was coupled to a common non-Markovian bosonic bath and introduced a pseudo-pure state as the initial state for the evolution of the system dynamics.Finally,we analyzed the effects of environmental memory effects,noise intensity,temperature,and magnetic field strength on quantum coherence and energy flow.Numerical simulation results show that,as the environmental correlation coefficient increases,the coherence of the system is enhanced.Energy flow back from the environment to the system may be feasible with the help of non-Markovian memory effects.

关 键 词：非马尔可夫环境 量子态扩散方法 相干性 能流 

分 类 号：O431.2[机械工程—光学工程]