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Résumé |
We explore spontaneous emission from ensembles of two-level atoms, in which the dimensions of the
ensemble are on the order of the wavelength of the transition. In this case, spontaneous emission is
collective, and the rate of emission depends on the many-body collective state of the system: dissipation
depends on the correlations present in the system. We first observe a superradiant emission and modified
Rabi oscillations, which signal the spontaneous emergence of two-body correlations. Finally by letting the
ensemble decay without drive, we observe subbradiance: a reduced decay to the environment. And by a local
control of the resonance frequency of the atoms, we are able to control subradiance and release “on
demand” the light that was stored in subradiant many-body states of the ensemble. |
