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Article Dans Une Revue Physical Review A : Atomic, molecular, and optical physics [1990-2015] Année : 2016

Propagation of light through small clouds of cold interacting atoms

Résumé

We demonstrate experimentally that a dense cloud of cold atoms with a size comparable to the wavelength of light can induce large group delays on a laser pulse when the laser is tightly focused on it and is close to an atomic resonance. Delays as large as −10 ns are observed, corresponding to " superluminal " propagation with negative group velocities as low as −300 m/s. Strikingly, this large delay is associated with a moderate extinction owing to the very small size of the dense cloud. It implies that a large phase shift is imprinted on the continuous laser beam. Our system may thus be useful for applications to quantum technologies, such as variable delay line for individual photons or phase imprint between two beams at the single-photon level.
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hal-01644379 , version 1 (22-11-2017)

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Stephan Jennewein, Yvan R. P. Sortais, J.-J. Greffet, Antoine Browaeys. Propagation of light through small clouds of cold interacting atoms. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2016, 94 (5), pp.053828 ⟨10.1103/PhysRevA.94.053828⟩. ⟨hal-01644379⟩
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