Experimental study of collective light scattering in dense cold atomic ensembles
Oral
Abstract
We study the collective scattering of near-resonant light by a dense cloud of cold atoms.
In such an ensemble, the interactions between light-induced dipoles produce nonlinearities potentially useful to deterministically generate non-classical states of light, a resources for quantum information processing. Besides, this system holds fundamental interest as an example of a many-body driven dissipative spin model.
We have built a new-generation experiment, where we load up to 15000 87Rb atoms in an optical tweezer with a variable beam waist.The resulting cloud has a length up to ∼ 80λ and a sub-λ width (λ = 780.2 nm). This geometry, sharing similarities with cavity and waveguide QED systems, displays effects such as super-and sub-radiance resulting from the interactions between dipoles.
We observe strong driven superradiance and using spatial filtering we isolate the free-space super-radiant emission modes and are now measuring their temporal and spatial correlations properties. We are also preparing the excitation of a subradiant spin wave, for its potential as a quantum memory.
In such an ensemble, the interactions between light-induced dipoles produce nonlinearities potentially useful to deterministically generate non-classical states of light, a resources for quantum information processing. Besides, this system holds fundamental interest as an example of a many-body driven dissipative spin model.
We have built a new-generation experiment, where we load up to 15000 87Rb atoms in an optical tweezer with a variable beam waist.The resulting cloud has a length up to ∼ 80λ and a sub-λ width (λ = 780.2 nm). This geometry, sharing similarities with cavity and waveguide QED systems, displays effects such as super-and sub-radiance resulting from the interactions between dipoles.
We observe strong driven superradiance and using spatial filtering we isolate the free-space super-radiant emission modes and are now measuring their temporal and spatial correlations properties. We are also preparing the excitation of a subradiant spin wave, for its potential as a quantum memory.
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Presenters
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Guillaume Tremblier
- Université Paris Saclay