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Q: Fachverband Quantenoptik und Photonik

Q 16: Quanteneffekte (Interferenz und Korrelationen)

Q 16.1: Talk

Monday, March 19, 2007, 16:30–16:45, 5E

Quantum correlations between photons scattered by strongly pumped regular structures — •Mihai Macovei, Jörg Evers, and Christoph H. Keitel — Max Planck Institute for Nuclear Physics, Heidelberg.

Interference light phenomena as well as photon correlations attract considerable attention due to their enormous potential applications [1].

As, at strong driving, the scattered light separates into distinct spectral bands, it is naturally to consider interference effects resulting from individual spectral lines. Here spectral photon correlations and cross-correlations of light scattered by a regular structure of strongly driven atoms are investigated [2]. In particular, we focus on spatial second-order intensity-intensity correlation functions in two- and multi-atom systems. We show that the cross-correlations between photons emitted in the spectral sidebands violate Cauchy-Schwartz inequalities, and that their emission ordering cannot be predicted, thus suggesting quantum entanglement between the photons.

[1] Roy J. Glauber, Rev. Mod. Phys. 78, 1267 (2006).

[2] M. Macovei, J. Evers, G.-x. Li, and C. H. Keitel, submitted; quant-ph/0606151.