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Pré-Publication, Document De Travail Année : 2010

Spin self-rephasing and very long coherence times in a trapped atomic ensemble

Résumé

We perform Ramsey spectroscopy on the ground state of ultra-cold 87Rb atoms magnetically trapped on a chip in the Knudsen regime. Field inhomogeneities over the sample should limit the 1/e contrast decay time to about 3 s. Nevertheless, decay times of 58 s are actually observed. We explain this surprising result by a spin self-rephasing mechanism induced by the identical spin rotation effect originating from particle indistinguishability. We propose a theory of this synchronization mechanism and obtain good agreement with the experimental observations. The effect is general and susceptible to appear in other physical systems.

Dates et versions

hal-00474488 , version 1 (20-04-2010)

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Christian Deutsch, Fernando Ramirez-Martinez, Clement Lacroûte, Friedemann Reinhard, Tobias Schneider, et al.. Spin self-rephasing and very long coherence times in a trapped atomic ensemble. 2010. ⟨hal-00474488⟩
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