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Atom-molecule dark states in a Bose-Einstein condensate

K. Winkler·G. Thalhammer·M. Theis·H. Ritsch·R. Grimm·J. Hecker Denschlag
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Abstract

We have created a dark quantum superposition state of a Rb Bose-Einstein condensate (BEC) and a degenerate gas of Rb$_2$ ground state molecules in a specific ro-vibrational state using two-color photoassociation. As a signature for the decoupling of this coherent atom-molecule gas from the light field we observe a striking suppression of photoassociation loss. In our experiment the maximal molecule population in the dark state is limited to about 100 Rb$_2$ molecules due to laser induced decay. The experimental findings can be well described by a simple three mode model.

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K. Winkler, G. Thalhammer, M. Theis, H. Ritsch, R. Grimm, J. Hecker Denschlag. 2005-05-30. Atom-molecule dark states in a Bose-Einstein condensate. https://doi.org/10.1103/physrevlett.95.063202

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