Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 63: Quantum Effects: Entanglement and Decoherence III

Q 63.4: Vortrag

Freitag, 12. März 2010, 15:00–15:15, A 310

Dissipation induced Tonks-Girardeau gas of polaritons — •Martin Kiffner and Michael Hartmann — Technische Universität München, Physik-Department I, James-Franck-Straße, 85748 Garching, Germany

In one-dimensional systems, bosons can behave with respect to many observables as if they were fermions. This strongly correlated regime of a Tonks-Girardeau (TG) gas regime can be reached for strong repulsive interactions between the particles. Recently, an experiment [1] with cold molecules showed that not only elastic interactions, but even two-particle losses alone are able to create a TG gas.

Here we derive a scheme for the generation of a Tonks-Girardeau (TG) gas of polaritons with purely dissipative interaction [2]. We put forward a master equation approach for the description of stationary light in atomic four-level media and show that, under suitable conditions, two-particle decays are the dominant photon loss mechanism. These dissipative two-photon processes increase the interaction strength by at least one order of magnitude as compared to their dispersive counterparts and can drive the polaritons into the TG regime. Our scheme allows to measure local and non-local correlations of the TG gas via quantum optical techniques.

[1] N. Syassen, D. M. Bauer, M. Lettner, T. Volz, D. Dietze, J. J. Garcia-Ripoll, J. I. Cirac, G. Rempe, S. Dürr, Science 320, 1329 (2009).

[2] M. Kiffner and M. J. Hartmann, arXiv:0908.2055.