Spin-squeezing and Dicke state preparation by heterodyne measurement
Spin-squeezing and Dicke state preparation by heterodyne measurement
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DOI：
10.1103/physreva.83.013821
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发表时间：
2010-02
影响因子：
2.9
通讯作者：
T. Vanderbruggen;S. Bernon;A. Bertoldi;A. Landragin;P. Bouyer
中科院分区：
文献类型：
--
作者：
T. Vanderbruggen;S. Bernon;A. Bertoldi;A. Landragin;P. Bouyer
我们研究了基于外差探测的原子居群的量子非拆除（QND）测量，并表明诱导的反作用允许制备自旋压缩态和迪克态。我们用一个波向量形式来描述测量的随机过程和相关的原子演化。导出了弱耦合状态下原子分布动量的短时间和长时间解析公式，与蒙特卡罗模拟结果吻合较好。讨论了所提外差检测方案的实验实现。考虑了自发辐射在压缩过程中的作用。
We investigate the quantum non-demolition (QND) measurement of an atomic population based on a heterodyne detection and show that the induced back-action allows to prepare both spin-squeezed and Dicke states. We use a wavevector formalism to describe the stochastic process of the measurement and the associated atomic evolution. Analytical formulas of the atomic distribution momenta are derived in the weak coupling regime both for short and long time behavior, and they are in good agreement with those obtained by a Monte-Carlo simulation. The experimental implementation of the proposed heterodyne detection scheme is discussed. The role played in the squeezing process by the spontaneous emission is considered.