Directional superradiant emission from statistically independent incoherent nonclassical and classical sources.
Directional superradiant emission from statistically independent incoherent nonclassical and classical sources.
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DOI：
10.1103/physrevlett.113.263606
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发表时间：
2014-03
影响因子：
8.6
通讯作者：
S. Oppel;R. Wiegner;G. Agarwal;J. Zanthier
中科院分区：
文献类型：
--
作者：
S. Oppel;R. Wiegner;G. Agarwal;J. Zanthier
自Dicke引入二能级原子系综增强定向自发发射的概念以来，超辐射一直是量子光学中的一个突出问题。这种效应是基于相关的集体迪克态，它们被证明是高度纠缠的。本文表明，通过测量发射辐射的高阶相关函数，统计独立的非相干源也可以产生增强的自发辐射定向发射。我们的分析适用于各种各样的量子发射体，如被困原子、离子、量子点或氮空位中心，也适用于非相干的经典发射体。这是实验证实了多达八个统计独立的热光源。测量高阶相关函数的安排对应于广义的Hanbury Brown-Twiss设置，表明两种现象，超辐射和Hanbury Brown-Twiss效应，源于同一干涉现象。
Superradiance has been an outstanding problem in quantum optics since Dicke introduced the concept of enhanced directional spontaneous emission by an ensemble of identical two-level atoms. The effect is based on the correlated collective Dicke states which turn out to be highly entangled. Here we show that enhanced directional emission of spontaneous radiation can be produced also with statistically independent incoherent sources, via the measurement of higher-order correlation functions of the emitted radiation. Our analysis is applicable to a wide variety of quantum emitters, like trapped atoms, ions, quantum dots, or nitrogen-vacancy centers, and is also valid for incoherent classical emitters. This is experimentally confirmed with up to eight statistically independent thermal light sources. The arrangement to measure the higher-order correlation functions corresponds to a generalized Hanbury Brown-Twiss setup, demonstrating that the two phenomena, superradiance and the Hanbury Brown-Twiss effect, stem from the same interference phenomenon.