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Q: Fachverband Quantenoptik und Photonik

Q 29: Quantum Effects

Q 29.1: Invited Talk

Wednesday, March 13, 2019, 10:30–11:00, S Gr. HS Maschb.

Nonlinear quantum transport of light in a cold atomic cloud — Tobias Binninger, Vyacheslav Shatokhin, Andreas Buchleitner, and •Thomas Wellens — Physikalisches Institut, Albert-Ludwigs-Universität, Hermann-Herder-Str. 3, D-79104 Freiburg

The theory of multiple scattering in dilute media that consist of a disordered collection of discrete scatterers relies on the division of the total scattering process into single scattering events. In standard multiple scattering theory, these are assumed to be linear (scattered field proportional to incident field). For atomic scatterers with transition frequency close to the laser frequency, however, nonlinear multi-photon scattering processes are induced at high laser intensities. To account for the impact of these processes on the multiple scattering signal, we present an approach which combines tools of diagrammatic multiple scattering theory (ladder and crossed diagrams) with quantum-optical methods (optical Bloch equations). This approach allows us to evaluate how quantum-mechanical scattering processes influence, both, diffusive propagation of the average light intensity through a dilute cloud of cold atoms (with distances between the atoms much larger than the laser wavelength), as well as effects of coherent light propagation such as coherent backscattering.

[1] T. Binninger, V. Shatokhin, A. Buchleitner, and T. Wellens, arXiv:1811.08882 (2018)