双原子Jaynes-Cummings模型下的量子失协和超量子失协  

Quantum discord andsuper quantum discord of two Jaynes-Cummings atoms

作　　者：徐鸿嘉 秦向瑜 闫学群 董广宗 肖宁如 XU Hong-Jia;QIN Xiang-Yu;YAN Xue-Qun;Dong Guang-Zong;XIAO Ning-Ru(School of Physical Science and Technology,Tian Gong University,Tianjin 300387,China)

机构地区：[1]天津工业大学物理科学与技术学院,天津300387

出　　处：《原子与分子物理学报》2022年第6期121-130,共10页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(11904263);天津市自然科学基金(S20QNC088);天津市自然科学基金(18JCQNJC73800)。

摘　　要：在量子信息的研究中,量子关联起着至关重要的作用,而弱测量对揭示量子关联有重要作用.在双原子Jaynes-Cummings(JC)模型下,分析了量子失协和超量子失协两种量子关联随时间演化过程中的差异性,以及测量强度参数、平均光子数在决定量子关联和影响其动态演化的一般作用.结果表明,弱测量可以更好地揭示量子关联,不仅可以更好地揭示量子关联的复活,还可以获得更大的关联最大值;平均光子数会有效影响两种关联的消失与复活,平均光子数越大,量子关联的消失与复活越快;平均光子数较大时,使用旋波近似得到的弱测量下的超量子失协比强测量下的量子失协与实际误差更小.In the study of quantum information,quantum correlation plays an important role and weak measurement has an important effect on the variation of quantum correlation.In the Jaynes-Cummings(JC)model of two atoms,we analyze the difference of evolution processes of quantum correlation with time between quantum discord and super quantum discord,and the general roles of measuring intensity parameters,average photon number in determining quantum correlation and influencing its dynamic evolution.The results show that the weak measurement can effectively protect the quantum correlation,which can not only accelerate the recovery of the quantum correlation,but also obtain a larger maximum correlation value.The average number of photons can effectively affect the disappearance and recovery of the two correlations.The larger the average number of photons is,the faster the disappearance and recovery of the quantum correlations will be;when the average number of photons is large,the actual error of the weak measurement with rotational wave approximation for super quantum discord is smaller than that of the strong measurement for quantum discord.

关 键 词：弱测量 量子关联 双原子JC模型 量子失协 超量子失协 

分 类 号：O413.2[理学—理论物理]