耗散腔量子电动力学系统中量子Fisher信息和量子相干性分布  

Quantum Fisher information and the distribution of quantum coherence in dissipative cavity quantum electrodynamics system

作　　者：贺启亮[1] 吴春艳 HE Qiliang;WU Chunyan(School of Physics and Electronic Science,Guizhou Normal University,Guiyang 550025,China)

机构地区：[1]贵州师范大学物理与电子科学学院,贵州贵阳550025

出　　处：《贵州师范大学学报（自然科学版）》2021年第4期76-82,共7页Journal of Guizhou Normal University：Natural Sciences

基　　金：国家自然科学基金(11364006);贵州省科技计划项目(黔科合LH字[2017]7343号)。

摘　　要：基于耗散腔量子电动力学系统,研究了两量子比特间的量子Fisher信息和量子相干性受环境耗散的影响。发现量子Fisher信息在初始时刻会随着时间的演化而增大,而且经过较长相互作用时间后,两量子比特间会呈现稳态的量子Fisher信息。其次,还发现环境耗散并不会完全摧毁两量子比特间的量子相干性,当作用时间较长时,稳态量子相干性可以在两量子比特间得以存活,并且稳态量子相干性对于系统的初始参数,环境的耗散系数以及腔场的平均光子数都非常敏感。最后,借助迹距离的方法,还探讨了环境耗散对于系统中量子信息流动的影响。The dynamics of quantum Fisher information and quantum coherence of two qubits in dissipative cavity quantum electrodynamics system is investigated.It is shown that the quantum Fisher information with respect to the decay rate increases with the time in the initial evolution,and the stationary non-zero value can arise in the long-time limit.Furthermore,we also find that the quantum coherence of two qubits is not destroyed by the dissipation for a finite time interval,and the stationary quantum coherence can survive in the interaction of qubits with cavities as the time approaches infinity.The stationary value of quantum coherence is sensitive with the initial parameters of the two qubits,the decay rate and the mean photon number.Finally,we study how the dissipation affect the transfer of quantum information of the system by making use of the trace distance.

关 键 词：量子Fisher信息 量子相干性 耗散腔量子电动力学系统 量子信息流动 

分 类 号：O413.2[理学—理论物理]