关联退极化量子信道中qutrit-qutrit系统的量子相干性演化  

Evolution of quantum coherence of qutrit-qutrit system under correlated depolarizing channels

作　　者：董曜 纪爱玲 张国锋[1] Dong Yao;Ji Ai-Ling;Zhang Guo-Feng(School of Physics,Beihang University,Beijing 100191,China;School of Physics,University of Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]北京航空航天大学物理学院,北京100191 [2]中国科学院大学物理学院,北京100190

出　　处：《物理学报》2022年第7期36-43,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:12074027)资助的课题。

摘　　要：为探索量子系统的退相干机制寻找延缓退相干的方法,本文研究了关联量子信道中的退相干过程,计算了关联退极化信道中两体qutrit系统的3种初态:一种特殊初态、最大相干初态和各向同性初态的范数相干性、相对熵相干性及基矢无关相干性.分析得出的解析结果、数值结果和演化图像可以发现:1)完全关联的信道能最大程度地抑制退相干;2)存在一个与关联度无关的最大退相干时间点,但其退相干的演化行为却依赖着关联度;3)信道的关联可以增强子系统间的相干性.基矢无关相干性遵循的不等式关系也在此系统中得以验证.In order to study the decoherence process of quantum system and find the ways to delay it,in this paper we investigate the decoherence process under correlated depolarizing channels by calculating the evolution of norm coherence,relative entropy coherence and basis-independent coherence of the three initial states:special initial state,maximum coherent state and isotropic state.From the analytic results,numerical results and evolution images,it can be found that 1)completely correlated channels can suppress decoherence to a greatest extent,.2)the time point at which maximum decoherence occurs is irrelevant to the degree of correlation,but system’s decoherence evolution behavior depends on it.3)the correlation of depolarizing channels can reinforce the collective quantum coherence between subsystems,and an inequality relation of basis-independent coherence is proved in this system.

关 键 词：退极化信道 关联度 量子相干性 退相干演化 

分 类 号：O413[理学—理论物理] TN918[理学—物理]