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Observation de paires d'atomes corrélés au travers de la collision de deux condensats de Bose-Einstein

Aurélien Perrin 1
1 laboratoire Charles Fabry de l'Institut d'Optique / Optique atomique
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : In this thesis, we report on the observation of pairs of correlated atoms produced in the collision of two Bose-Einstein condensates of metastable helium. Three laser beams perform a Raman transfer which extracts the condensate from the magnetic trap and separates it into two parts with opposite mean momenta. While the condensates propagate, elastic scattering of pairs of atoms occurs, whose momenta satisfy energy and momentum conservation laws. Metastable helium atoms large internal energy allows the use of a position-sensitive, single-atom detector which permits a three-dimensional reconstruction of the scattered atoms' momenta. The statistics of these momenta show correlations for atoms with opposite momenta. The measured correlation volume can be understood from the uncertainty-limited momentum spread of the colliding condensates. This interpretation is confirmed by the observation of the momentum correlation function for two atoms scattered in the same direction. This latter effect is a manifestation of the Hanbury Brown-Twiss effect for indistinguishable bosons. Such a correlated-atom-pair source is a first step towards experiments in which one would like to confirm the pairs' entanglement.
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Submitted on : Thursday, February 7, 2008 - 12:41:17 PM
Last modification on : Wednesday, September 16, 2020 - 5:37:39 PM
Long-term archiving on: : Thursday, September 27, 2012 - 5:51:27 PM

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  • HAL Id : tel-00244641, version 1

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Aurélien Perrin. Observation de paires d'atomes corrélés au travers de la collision de deux condensats de Bose-Einstein. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2007. Français. ⟨tel-00244641⟩

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