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Phys Rev Lett. 2008 Sep 19;101(12):120501. Epub 2008 Sep 17.

Quantum memory with optically trapped atoms.

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  • 1Physikalisches Institut, Universit├Ąt Heidelberg, Heidelberg, Germany.


We report the experimental demonstration of quantum memory for collective atomic states in a far-detuned optical dipole trap. Generation of the collective atomic state is heralded by the detection of a Raman scattered photon and accompanied by storage in the ensemble of atoms. The optical dipole trap provides confinement for the atoms during the quantum storage while retaining the atomic coherence. We probe the quantum storage by cross correlation of the photon pair arising from the Raman scattering and the retrieval of the atomic state stored in the memory. Nonclassical correlations are observed for storage times up to 60 mus.

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