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双原子Dicke模型的自旋压缩

发表时间:2012-08-15  浏览量:2322  下载量:988
全部作者: 吴玲娜,王腾龙,金光日
作者单位: 北京交通大学理学院
摘 要: 以单模光腔中冷原子系综的Dicke模型作为研究对象,力图系统地研究腔内原子自旋压缩和光场量子统计性质。利用旋转波近似,给出了2个全同原子情况Dicke模型的严格解。计算结果表明:从相干直积态出发,原子和光场几乎同时演化为非经典压缩态,原子自旋压缩程度依赖于光场初态。此外,还给出了自旋压缩系数及减小的涨落近似表达式。
关 键 词: 量子光学;Dicke模型;自旋压缩;量子涨落
Title: Spin squeezing of two-atom Dicke model
Author: WU Lingna, WANG Tenglong, JIN Guangri
Organization: College of Science, Beijing Jiaotong University
Abstract: This paper focused on the so-called Dicke model, a quantum-optical model that describes an ensemble of N two-level atoms interacting with a single-mode cavity field, with the purpose to investigate quantum fluctuations of intracavity atoms and photons. Using rotating-wave approximation, the Dicke model with two identical atoms can be solved exactly. The results show that the atoms and the field evolve to non-classical squeezing state almost at the same time, with the degree of squeezing depending on the initial state of the field. In addition, analytic expressions of spin-squeezing parameter and Fano factor of the light field are derived.
Key words: quantum optics; Dicke model; spin squeezing; quantum fluctuation
发表期数: 2012年8月第15期
引用格式: 吴玲娜,王腾龙,金光日. 双原子Dicke模型的自旋压缩[J]. 中国科技论文在线精品论文,2012,5(15):1421-1426.
 
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