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arXiv 1606.09372quant-ph
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少原子系统中有限尺寸效应与偶极-偶极相互作用的竞争

Competition between finite-size effects and dipole-dipole interactions in few-atom systems

F. Damanet, J. Martin

摘要:

本文研究了真空中电磁场作用下少原子系统中有限尺寸效应(即粒子的可伸缩性)与偶极-偶极相互作用之间的竞争。我们考虑两个标志的合作效应,超辐射和亚辐射,并计算每个原子辐射的能量率和原子状态的相干性在时间演化。我们采用统计方法,以提取原子动力学的典型行为和平均随机原子分布在球形容器与规定的$k_0R$与$k_0$的辐射波数和$R$的平均原子间距离。我们的方法使我们能够突出有限尺寸效应和偶极-偶极相互作用在超辐射/亚辐射之间的权衡。特别是,我们证明了存在一个最佳值的$k_0R$的超辐射强度和相干脉冲的影响较小,由偶极-偶极相互作用和有限尺寸效应引起的退相效应。

英文摘要:

In this paper, we study the competition between finite-size effects (i.e. discernibility of particles) and dipole-dipole interactions in few-atom systems coupled to the electromagnetic field in vacuum. We consider two hallmarks of cooperative effects, superradiance and subradiance, and compute for each the rate of energy radiated by the atoms and the coherence of the atomic state during the time evolution. We adopt a statistical approach in order to extract the typical behavior of the atomic dynamics and average over random atomic distributions in spherical containers with prescribed $k_0R$ with $k_0$ the radiation wavenumber and $R$ the average interatomic distance. Our approach allows us to highlight the tradeoff between finite-size effects and dipole-dipole interactions in superradiance/subradiance. In particular, we show the existence of an optimal value of $k_0R$ for which the superradiant intensity and coherence pulses are the less affected by dephasing effects induced by dipole-dipole interactions and finite-size effects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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