囚禁离子非线性Rabi模型量子场熵演化特性  

Entropy evolution of quantum field in nonlinear Rabi model of trapped ions

作　　者：鲁恩民 王中结[1] LU En-Min;WANG Zhong-Jie(College of Physics and Electronic Information,Anhui Normal University,Wuhu 241000,China)

机构地区：[1]安徽师范大学物理与电子信息学院,芜湖241000

出　　处：《原子与分子物理学报》2022年第3期105-110,共6页Journal of Atomic and Molecular Physics

基　　金：安徽省自然科学基金(090412060)。

摘　　要：本文研究了基于单个囚禁离子与两束激光场相互作用的非线性Rabi模型中的纠缠动力学.利用Von-Neumann熵来表征纠缠度.通过数值模拟,详细讨论了Lamb-Dicke参数对量子场熵的影响.在单光子非线性Rabi模型中,随着Lamb-Dicke参数和初始平均光子数的增加,场熵的平均值并不单调增加.在双光子非线性Rabi模型中,场熵的时间演化是周期性振荡的.随着Lamb-Dicke参数的增加,场熵的周期振荡逐渐消失.对于较小的Lamb-Dicke参数,纠缠和退纠缠周期性地出现.In this paper, the dynamics of entanglement in the nonlinear Rabi model based on a single trapped ion interacting with two light fields is investigated. The Von-Neumann entropy is used to characterize the degree of entanglement. By numerical simulation, we discuss the influence of Lamb-Dicke parameter on the quantum field entropy in detail. In the single photon nonlinear Rabi model, with the increases of the Lamb-Dicke parameter and the initial average photon number, the average value of the field entropy does not increase monotonously. In the two-photon nonlinear Rabi model, time evolution of the field entropy oscillates periodically. With the increasing of Lamb-Dicke parameter, this periodic oscillation of the field entropy gradually disappears. For smaller Lamb-Dicke parameter, entanglement and disentanglement appear periodically.

关 键 词：量子光学 量子纠缠 囚禁离子 非线性Rabi模型 量子场熵 

分 类 号：O64[理学—物理化学]