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| 自发辐射诱导原子质心运动退相干的理论研究 | |
| 引用本文： | 姜文英,赵志敏,刘玉洁,张文举,郑丽,郑泰玉.自发辐射诱导原子质心运动退相干的理论研究[J].中山大学学报(自然科学版),2014,53(4):52-55,61. |
| 作者姓名： | 姜文英 赵志敏 刘玉洁 张文举 郑丽 郑泰玉 |
| 作者单位： | 1.南京航空航天大学自动化学院，江苏南京 210016； 2.桂林电子科技大学电子工程与自动化学院，广西桂林 541004； 3.大连工业大学信息科学与工程学院，辽宁大连 116034； 4.大连工业大学生物工程学院，辽宁大连 116034； 5.东北师范大学物理学院，吉林长春 130024 |
| 基金项目： | 吉林省自然科学基金资助项目(201115007);国家自然科学基金资助项目(11105021,11175044) |
| 摘 要： | 研究单个二能级原子与真空电磁场的相互作用,给出了总系统的薛定谔方程的解析波函数,并分析得出原子质心运动的约化密度矩阵。结果表明原子内部电子态与真空场的相互作用会诱导原子的质心运动与原子的内部电子态发生纠缠,从而会导致原子的质心运动发生量子退相干。文中还给出了退相干因子的解析表达式,并通过图形演示了原子质心运动退相干的动力学演化情况,以及与原子的空间尺度和原子-场耦合强度的相关性。 |
| 关 键 词： | 量子退相干 真空自发辐射 质心运动 二能级原子 |
| 收稿时间： | 2014-01-17; |
Spatial Decoherence Induced by Spontaneous Emission |
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| JIANG Wenying,ZHAO Zhimin,LIU Yujie,ZHANG Wenju,ZHENG Li,ZHENG Taiyu.Spatial Decoherence Induced by Spontaneous Emission[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2014,53(4):52-55,61. | |
| Authors: | JIANG Wenying ZHAO Zhimin LIU Yujie ZHANG Wenju ZHENG Li ZHENG Taiyu |
| Institution: | JIANG Wenying;ZHAO Zhimin;LIU Yujie;ZHANG Wenju;ZHENG Li;ZHENG Taiyu;College of Automation Engineering,Nanjing University of Aeronautics and Astronautics;College of Automation & Electronic Engineering,Guilin University of Electronic Technology;School of Information Science and Engineering,Dalian Polytechnic University;School of Biological Engineering,Dalian Polytechnic University;School of Physics,Northeast Normal University; |
| Abstract: | The decoherence dynamics of a two-level atom coupled into a vacuum electromagnetic field are studied. The analytic solution of the Schrodinger equation has been given, and then the reduced density matrix for the motion of the atomic center of mass has been derived. It is shown that spontaneous emission induces the entanglement between the atomic spatial motion and the atomic electronic states, which induces the spatial quantum decoherence of the atom. The decoherence factor is given, and its properties, such as dynamical evolution with time and evolution for different atomic positions, are demonstrated by some figures. |
| Keywords: | quantum decoherence spontaneous emission motion of the center of mass two-level atom |
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