Observation of a non-equilibrium superradiant phase transition in free space - Groupe d'Optique Quantique Access content directly
Preprints, Working Papers, ... Year : 2022

Observation of a non-equilibrium superradiant phase transition in free space

Abstract

We observe a non-equilibrium phase transition in a driven dissipative quantum system consisting of an pencil-shape cloud of up to $N\approx 2000$ laser-cooled atoms in free space, optically excited along its main axis. We find that our data are well reproduced by the Driven Dicke model, which assumes a sub-wavelength sample volume, by simply using an effective atom number. By measuring the excited state population of the atoms and the light emitted in the superradiant mode, we characterize the dynamics of the system and its steady-state properties. In particular, we observe the characteristic $N^2$ scaling of the photon emission rate in the superradiant phase, thus demonstrating steady-state superradiance in free space. Finally, we observe a modification of the statistics of the superradiant light as we cross the phase transition.
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Dates and versions

hal-03836768 , version 1 (02-11-2022)

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Giovanni Ferioli, Antoine Glicenstein, Igor Ferrier-Barbut, Antoine Browaeys. Observation of a non-equilibrium superradiant phase transition in free space. 2022. ⟨hal-03836768⟩
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