Quantum Memory with Optically Trapped Atoms

Date: 2008-09-17
Authors Chih-Sung Chuu, Thorsten Strassel, Bo Zhao, Markus Koch, Yu-Ao Chen, Shuai Chen, Zhen-Sheng Yuan, Joerg Schmiedmayer and Jian-Wei Pan.
Journal No. Phys. Rev. Lett. 101, 120501 (2008)
Abstract 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 retrieva l of the atomic state stored in the memory. Nonclassical correlations are observed for storage times up to 60  μs.