## News

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.

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.

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.

An important step towards the realization of a VUV photon condensate has been achieved.

Our paper “Quantum Rabi dynamics of trapped atoms far in the deep strong coupling regime“ has been published in the journal Nature Communications. We report on a study of ultrastrong coupling between two mechanical modes of trapped cold atoms in the quantum Rabi regime. Using a novel experimental scheme, we achieve a Rabi coupling of 6.5 times the field mode frequency, so that the coupling term clearly dominates over all other energy scales for the first time.

The grand-canonical coupling of photons to a bath of dye molecules leads to fluctuations of the particle number. According to the fluctuation-dissipation theorem this is connected to a viscosity of the photon gas. In our experiment, we were able to prove the relation for a Bose-Einstein condesed gas for the first time.

Andreas Redmann presented his PhD project at the Excellence Slam of the university.

Our group members Steffi Moll and Niels Wolf presented experiments on the foundations of quantum physics in Regensburg.

Our paper "Compressibility and the equation of state of an optical quantum gas in a box" appeared in Science.

Read the full story here: Science 375, 1403 (2022)

And there is also a nice perspectice article "Photons think inside the box" by R.J. Fletcher and M. Zwierlein.

[ Press release ]

[ Science Perspective article by R. Fletcher and M. Zwierlein ]

[ New Scientist article by A. Wilkins ]

[ Media Inaf article by V. Guglielmo ]

[ Physics World article by S. Jarman ]