Our group conducts experiments on the following topics: thermodynamics of light, as Bose-Einstein condensation of photons in microcavities, and the statistics and dynamics of photons in tailored potentials. We also investigate topology and quantum simulation with ultracold atomic gases.

We are always looking for Bachelor, Master, PhD students, and postdocs. For more information, see here.

Latest news
Ultracold Rubidium atoms in lattices simulate strongly coupled systems

The quantum Rabi model describes the coupling of a two-level system to a bosonic mode, one prominent example is an atom coupled to a light field. When the coupling gets stronger than the relevant energy scales of the atom and the light field new effects are expected, for example a collapse ad revival of the initial state. In optical systems, however, this regime is not achievable, but cold atoms can simulate this regime. This proposal, conceived together with our theory colleagues from Bilbao, has been tested successfully in our lab.

Dr. Julian Schmitt receives the Wissenschaftspreis 2024 of the Industrie-Club Düsseldorf

Dr. Julian Schmitt from the Institute of Applied Physics received the Wissenschaftspreis 2024 of the Industrie-Club Düsseldorf for his groundbreaking research on quantum gases of photons, which on the one hand expand the understanding of quantum states in fundamental science and on the other hand can produce new technological components for the sensor technology or control of laser beams.

The quantum regression theorem has been verified for an optical quantum gas

A fundamental relation connecting the temporal fluctuations and the response behaviour has been experimentally observed in a quantum gas made of photons, the particles of light. The validity of this so-called quantum regression theorem could so far not be directly revealed for quantum gases.

Julian Schmitt awarded the Rudolf-Kaiser-Prize for Experimental Physics 2023

Dr. Julian Schmitt of the Institute for Applied Physics of the University of Bonn is awarded the Rudolf-Kaiser-Prize 2023 - one of the most renowned German prizes for young researchers in physics. 

Our research

© H. Brammer/U Bonn

Erbium Experiment:
Topology with Ultracold  Atoms

Eine Wissenschaftlerin und ein Wissenschaftler arbeiten hinter einer Glasfassade und mischen Chemikalien mit Großgeräten.
© AG Weitz

Rubidium Experiment:
Quantum Simulation 

© U. Vogl / AG Weitz

Ultradense Gases: Laser Cooling & Spectroscopy

© AG Weitz

Spectroscopy of High Pressure Gases:
Novel Light Sources in the VUV

© T. Damm/U Bonn

Photon Bose-Einstein-Condensation: Statistical Physics

© C. Kurtscheid/U Bonn

Bose-Einstein-Condesates of Photons in Variable Potentials


Institut für Angewandte Physik
Wegelerstraße 8
Universität Bonn
53115 Bonn, Germany

Group leader:
Prof. Dr. Martin Weitz
Tel.: +49 (0)228 73-4837

Group administration:
Kerstin Steinseifer
Tel.: +49 (0)228 73-4836

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