Berlin 2005 – scientific programme

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Q: Quantenoptik und Photonik

Q 33: Quantenkommunikation II

Q 33.5: Talk

Tuesday, March 8, 2005, 11:45–12:00, HU Audimax

Generation of non-classical photon pairs with quantum memory — •Stephanie Manz, Anke Klafs, Dennis Heine, Alois Mair, Thomas Fernholz, Jörg Schmiedmayer und Jian-Wei Pan — Physikalisches Institut, Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg

Quantum memories are an important ingredient for long distance quantum communication schemes. We report on experiments towards the realisation of a quantum node, following the DLCZ scheme [1]. A Raman process is used to create non-classical, collective states in hot Rubidium vapour, which can be converted into light. Upon detection of a spontaneously scattered Stokes-photon, we retreive a correlated Anti-Stokes photon after a controllable period of time. Coincidence measurements show a violation of a Cauchy-Schwarz inequality that holds for classical fields.

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