双模压缩真空场中原子间相对位置的量子退相干  

Quantum Decoherence of the Relative Position Between Two Atoms in the Two-mode Squeezed States

作　　者：李敏[1] 李晓英[2] 杨柳[3] 

机构地区：[1]集美大学诚毅学院,福建厦门361021 [2]集美大学轮机工程学院,福建厦门361021 [3]北京市161中学,北京100031

出　　处：《集美大学学报（自然科学版）》2008年第3期271-275,共5页Journal of Jimei University：Natural Science

摘　　要：利用全量子理论,研究了双模压缩真空态光场中,两原子质心运动的量子动力学演化特性.通过计算,得到了两原子之间相对位置的密度约化矩阵和退相干因子的表达式,发现:1)在双模压缩态光场中,这对原子的自发辐射能够诱导质心运动的退相干;2)随着压缩因子γ的增大,量子退相干现象越来越明显.By the full quantum theory, the dynamical evolution of the motion of C. M of two atoms in the two-mode squeezed vacuum states was studied. Through caculating, the reduced density matrix of the relative position of two atoms and decoherence factor were obtained. It was found out： 1 ） the spontaneous radiation of the couple of atoms could induce the decoherence for the motion of C. M in the two-mode squeezed vacuum state; 2） the phenomenon of quantum decoherence became more clear with the squeezed factor changing bigger.

关 键 词：双模压缩真空场 原子间相对位置 量子退相干 白发辐射 压缩因子 

分 类 号：O431.2[机械工程—光学工程]