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arXiv 1702.07692quant-ph
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非对称激发态衰减对原子$\times$量子点相干布居囚禁的影响

Influence of the asymmetric excited state decay on coherent population trapping: atom $\times$ quantum dot

H. S. Borges, M. H. Oliveira, C. J. Villas-Boas

摘要:

电磁感应透明(EIT)是一种光学现象,它允许通过施加控制场来急剧修改原子系统的光学性质。在过去的几十年里,人们对它进行了大量的研究,现在我们可以找到大量的实验和理论研究。最近在量子点分子(QDM)中也发现了类似的现象,其中控制场被量子点之间的隧穿速率所取代。结果表明,在EIT区,QDM和原子系统的光学性质是相同的。然而,在这里,我们表明,在强探测场制度,即,在“相干布居捕获”(CPT)机制下,两个系统的光学性质出现了很大的差异。结果表明,这种差异的根源在于两个系统的激发态的不同衰减速率,这意味着它们的高阶非线性极化率存在很大的差异。最后,我们研究了原子/量子力学与腔模强耦合的光学响应。特别地,当与原子-腔系统相比时,QDM-腔系统具有允许CPT机制中的暗态共振的宽度更好地变窄的优点。

英文摘要:

Electromagnetically induced transparency (EIT) is an optical phenomenon which allows a drastic modification of the optical properties of an atomic system by applying a control field. It has been largely studied in the last decades and nowadays we can find a huge number of experimental and theoretical related studies. Recently a similar phenomenon was also shown in quantum dot molecules (QDM) , where the control field is replaced by the tunneling rate between quantum dots. Our results show that in the EIT regime, the optical properties of QDM and the atomic system are identical. However, here we show that in the strong probe field regime, i.e., "coherent population trapping" (CPT) regime, it appears a strong discrepancy on the optical properties of both systems. We show that the origin of such difference relies on the different decay rates of the excited state of the two systems, implying in a strong difference on their higher order nonlinear susceptibilities. Finally, we investigate the optical response of atom/QDM strongly coupled to a cavity mode. In particular, the QDM-cavity system has the advantage of allowing a better narrowing of the width of the dark state resonance in the CPT regime when compared with atom-cavity system.

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