We report the observation of subradiance in dense ensembles of cold ${}^{87}\mathrm{Rb}$ atoms operating near Dicke’s regime of a large number of atoms in a volume with dimensions smaller than the transition wavelength. We validate that the atom number is the only cooperativity parameter governing subradiance. We probe the dynamics in the many-body regime and support the picture that multiply excited subradiant states are built as a superposition of singly excited states that decay independently. Moreover, we implement an experimental procedure to release the excitation stored in the long-lived modes in a pulse of light. This technique is a first step towards the realization of tailored light storing based on subradiance.

中文翻译：

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浓原子云中亚辐射激发的存储和释放

我们报告了在寒冷的密集合奏中亚辐射的观察 ${}^{87}b$原子在Dicke态附近操作，该体积中的大量原子尺寸小于过渡波长。我们验证原子数是控制亚辐射度的唯一合作参数。我们探讨了多体态中的动力学，并支持将多重激发的亚辐射态构建为独立衰减的单激发态的叠加的图。此外，我们实施了一个实验程序来释放以光脉冲形式存储在长寿命模式中的激发。该技术是实现基于亚辐射的量身定制的光存储的第一步。