Frankfurt 2006 – scientific programme

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Q: Quantenoptik und Photonik

Q 76: Poster Quantenkommunikation

Q 76.5: Poster

Thursday, March 16, 2006, 16:30–18:30, Labsaal

Generation of Single-Photon Pairs with Cold Atoms as Quantum Memory — •Thorsten Straßel, Yu-Ao Chen, Dennis Heine, Shuai Chen, Jörg Schmiedmayer, and Jian-Wei Pan — Physikalisches Institut , Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg

A source of correlated photon pairs with controllable delay using quantum memory can be used in protocols for long-distance quantum communication such as the DLCZ scheme [1]. We report on our work towards extension of the memory time. The single photons are generated by spontaneous Raman scattering on the D1-line in cold Rubidium atoms. A cold atom cloud of ⁸⁷Rb serving as quantum memory is prepared in a magneto-optical trap (MOT). It can be demonstrated that the correlation measurements of the photon pairs violate the Cauchy-Schwarz inequality which is valid for classical light.

[1] L.-M. Duan, M. D. Lukin, J.I. Cirac, and P. Zoller. Long-distance quantum communication with atomic ensembles and linear optics. Nature, 414:413, Nov 2001.