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C. Chuu, T. Strassel, B. Zhao, Markus Koch, Y.-A. Chen, S. Chen, Z.-S. Yuan, H.-J. Schmiedmayer, J.-W. Pan:
"Quantum Memory with Optically Trapped Atoms";
Physical Review Letters, 101 (2008), 120501; 120501-1 - 120501-4.

We report the experimental demonstration of quantum memory for collective atomic states in a fardetuned 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 μs.

http://dx.doi.org/10.1103/PhysRevLett.101.120501

http://publik.tuwien.ac.at/files/PubDat_169277.pdf