囚禁离子非线性J-C模型量子态保真度  

Fidelity of quantum states in the nonlinear J-C model of trapped ion

作　　者：刘宝元[1] 孙小斌 刘王云[1] 张玉虹[1] LIU Bao-Yuan;SUN Xiao-Bin;LIU Wang-Yun;ZHANG Yu-Hong(School of Optoelectronic Engineering,Xi’an Technological University,Xi’an 710021,China;Science and Technology Resources Coordinating Center ofAnkang City,Ankang 725000,China)

机构地区：[1]西安工业大学光电工程学院,西安710021 [2]安康市科技资源统筹中心,安康725000

出　　处：《原子与分子物理学报》2021年第4期120-125,共6页Journal of Atomic and Molecular Physics

基　　金：陕西省教育厅自然基础研究计划(17JK0389)。

摘　　要：用全量子理论研究驻波激光场与囚禁离子相互作用系统中量子态保真度,详细讨论离子质心在驻波激光场中位置及离子初始状态对保真度的影响. 结果表明:随着囚禁离子从远离驻波激光场波节处向波节处移动,量子态保真度振荡频率越来越高,振荡幅度几乎不变,且保真度到达第一个极小值所用时间越来越短,但不会出现信息完全失真;随着囚禁离子处于基态概率增加,量子态保真度振荡频率几乎不变,振荡幅度越来越小,也不会出现信息完全失真;在信息储存或传递过程中,囚禁离子量子态失真比系统和驻波场量子态失真小.The fidelity of quantum states in the system of an ion trapped in a harmonic potential interacting single quantum resonantly with a standing wave laser field is studied by means of full quantum theory, and the influences of the positions of the ion in the harmonic potential and the initial states of the trapped ion on the fidelity are discussed in detail. The results show that: As the trapped ion moves from the wave node which is far away from the standing wave laser field to the wave node, the oscillation frequency of quantum state fidelity is faster and faster, the oscillation amplitude is almost constant, and the time of fidelity reaching the first minimum is shorter and shorter, but the information is not completely distorted. As the probability of trapped ion in the ground state increases, the oscillation frequency of quantum state fidelity is almost constant, the oscillation amplitude is smaller and smaller, and there is no complete distortion of information too. The distortion of the trapped ion quantum state is smaller than those of the system and the cavity field quantum state in the process of quantum information storage or transmission.

关 键 词：保真度 囚禁离子 非线性J-C模型 全量子理论 

分 类 号：O431.2[机械工程—光学工程]