Bhatti Daniel, Schneider Raimund, Oppel Steffen, von Zanthier Joachim
Institut für Optik, Information und Photonik, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany.
Erlangen Graduate School in Advanced Optical Technologies (SAOT), Universität Erlangen-Nürnberg, 91052 Erlangen, Germany.
Phys Rev Lett. 2018 Mar 16;120(11):113603. doi: 10.1103/PhysRevLett.120.113603.
We investigate Dicke subradiance of N≥2 distant quantum sources in free space, i.e., the spatial emission patterns of spontaneously radiating noninteracting multilevel atoms or multiphoton sources, prepared in totally antisymmetric states. We find that the radiated intensity is marked by a full suppression of spontaneous emission in particular directions. In resemblance to the analogous, yet inverted, superradiant emission profiles of N distant two-level atoms prepared in symmetric Dicke states, we call the corresponding emission patterns directional Dicke subradiance. We further derive that higher-order intensity correlations of the light emitted by statistically independent thermal light sources display the same directional Dicke subradiant behavior and show that it stems from the same interference phenomenon as in the case of quantum sources. We finally present measurements of directional Dicke subradiance for N=2,…,5 distant thermal light sources corroborating the theoretical findings.
我们研究了自由空间中N≥2个远距离量子源的迪克亚辐射，即处于完全反对称态的自发辐射非相互作用多能级原子或多光子源的空间发射模式。我们发现，辐射强度的特征是在特定方向上自发发射完全被抑制。与处于对称迪克态的N个远距离二能级原子的类似但相反的超辐射发射轮廓相似，我们将相应的发射模式称为定向迪克亚辐射。我们进一步推导得出，统计独立热光源发射的光的高阶强度关联呈现相同的定向迪克亚辐射行为，并表明其源于与量子源情况相同的干涉现象。我们最终给出了N = 2，…，5个远距离热光源的定向迪克亚辐射测量结果，证实了理论发现。
