Number-chaotic State光场与原子相互作用耦合系统中的量子关联  

Quantum Correlations in a Coupled System of Two Atoms Interacting with Number-chaotic State Field

作　　者：格日乐 张燕 呼斯楞 萨楚尔夫[2] Gerile;ZHANG Yan;Husileng;Sachuerfu(College of Information Engineering,Pioneer College,Inner Mongolia University,Hohhot O10070,China;College of Physics and Electronic Information,Inner Mongolia Normal University,Hohhot O10022,China)

机构地区：[1]内蒙古大学创业学院,信息工程学院,内蒙古呼和浩特010070 [2]内蒙古师范大学,物理与电子信息学院,内蒙古呼和浩特010022

出　　处：《量子光学学报》2024年第3期82-91,共10页Journal of Quantum Optics

基　　金：内蒙古自治区高等学校科学研究项目(NJZY21293);内蒙古大学创业学院自然科学基金项目(N2021025);内蒙古大学创业学院量子信息科研团队成果。

摘　　要：在强度关联耦合(IDC)条件下,对单模Number-chaotic State光场与两个二能级原子相互作用系统中的纠缠与量子关联动力学演化特性进行了探究。着重研究了多光子跃迁和强度耦合参数对纠缠与量子关联特性的影响。结果表明,当量子纠缠为零时,原子间仍然存在着一定的量子关联效应。随光场光子数的增大,纠缠与量子关联演化的周期均变短,光子跃迁数增大将使得量子纠缠与量子关联的演化呈现无规振荡形式。Entanglement is a kind of quantum correlations that has been recognized as a valuable resource for quantum information processing.In this paper,we examine the quantum correlations in a system of two two-level atoms interacting with two single-mode cavities in the number-chaotic state via multi-photon transitions under intensity-dependent coupling.The influences of k-photons and intensity-dependent coupling on entanglement and quantum correlations are studied.It is found that when the entanglement is equal to zero,there still exist non-zero quantum correlations in the system.We have observed that,by increasing the number of photons,the periods of the evolution for various correlations become shorter and the evolution behavior of various correlations appears irregularly.Method This paper have discussed some new features of quantum correlations in a system of two two-level atoms interacting with two single-mode number-chaotic state field via multi-photon transitions under intensity-dependent coupling.We begin with introducing the system's Hamiltonian.Then,using the full quantum theory and quantum information methods to investigate the quantum correlations in the above mentioned system,we have obtained an analytic expressions of the concurrence,entanglement,and quantum discord and geometric measure of quantum discord over time in the end.Results and Discussions We employ the formulas obtained in the previous section to display the effect of Werner state parameter r,k-photon,photon number,and intensity-dependent coupling F(n)on concurrence,quantum discord,and geometrical measure of quantum discord,and classical correlation.The evolution figures show that when 0≤r≤0.333 the concurrence is zero,while 0.333<r<1,one can see that the concurrence C,QD,GMQD and CC evolve periodically and entanglement sudden death phenomenon occurs,as r increases the local maximum value of the concurrence C increases and tends to 1 when r=1.k-photon increase the number of oscillations and destroy the symmetry behavior of the concurrence C

关 键 词：量子光学 量子关联 量子纠缠 Number-chaotic state光场 多光子跃迁 

分 类 号：O431.2[机械工程—光学工程]