Direct measurement of the Wigner time delay for the scattering of light by a single atom

Abstract : We have implemented the Gedanken experiment of an individual atom scattering a wave packet of near-resonant light, and measured the associated Wigner time delay as a function of the frequency of the light. In our apparatus, the atom behaves as a two-level system and we have found delays as large as 42 ns at resonance, limited by the lifetime of the excited state. This delay is an important parameter in the problem of collective near-resonant scattering by an ensemble of interacting particles, which is encountered in many areas of physics.
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Optics Letters, Optical Society of America, 2013, 38, pp.1963-1965. 〈10.1364/OL.38.001963〉
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R Bourgain, J Pellegrino, Stephan Jennewein, Yvan R. P. Sortais, Antoine Browaeys. Direct measurement of the Wigner time delay for the scattering of light by a single atom. Optics Letters, Optical Society of America, 2013, 38, pp.1963-1965. 〈10.1364/OL.38.001963〉. 〈hal-01102237〉

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