

Overview
Theoretical quantum optics is my main research interest, that is, the quantum scale interaction of light with atoms, molecules, or solid state materials.
Quantum optics not only displays the principles of quantum mechanics in their purest form but also makes them visible on a rather macroscopic scale which can lead to many surprising effects. One of those is socalled electromagnetically induced transparency, i.e., the suppression of resonant light absorption, which happens without decreasing the interaction strength. Based on this and similar effects are many of the subfields studied in my group, e.g., quantum information processing, superradiance, or metamaterials. The success of these projects is based on (a) the fact that light can probe and manipulate the response of atoms (and other quantum systems) and (b) the use of socalled quantum interference.
Recent highlights of our research include ideas on "light storage" and a quantum opticsbased negative index of refraction without absorption, as well as quantum optics with molecules and cooperative (superradiant) systems. As is typical for this field, we have some very close collaborations with experimental groups.

