Glicenstein Antoine, Ferioli Giovanni, Browaeys Antoine, Ferrier-Barbut Igor
Opt Lett. 2022 Mar 15;47(6):1541-1544. doi: 10.1364/OL.451903.
We report a time-resolved study of collective emission in dense ensembles of two-level atoms. We compare, on the same sample, the buildup of superradiance and subradiance from the ensemble when driven by a strong laser. This allows us to measure the dynamics of the population of superradiant and subradiant states as a function of time. In particular, we demonstrate the buildup in time of subradiant states through superradiant dynamics. This illustrates the dynamics of the many-body density matrix of superradiant ensembles of two-level atoms when departing from the ideal conditions of Dicke superradiance, in which symmetry forbids the population of subradiant states.
我们报告了一项关于两能级原子密集系综中集体发射的时间分辨研究。在同一样本上，我们比较了强激光驱动下该系综中超辐射和亚辐射的形成过程。这使我们能够测量超辐射态和亚辐射态的粒子数随时间的动态变化。特别地，我们通过超辐射动力学展示了亚辐射态随时间的形成过程。这阐明了两能级原子超辐射系综的多体密度矩阵在偏离狄克超辐射的理想条件时的动力学情况，在理想条件下，对称性禁止亚辐射态的粒子数分布。
