Here he formed his international research group
, amounting to around 20 members today and continuously expanding. His group focuses mainly on theoretical research in the fields of quantum information and quantum thermodynamics, but also has built up experiments in quantum optics. He and his group are among the pioneers of the emerging field of quantum thermodynamics, that aims to understand how and if fundamental thermodynamic laws change when considering the nature of information to be quantum. In particular, they investigate the notions of energy, heat and work for quantum systems and the ultimate limitations on measurements of time imposed by thermodynamics. Besides their contribution to theoretical and experimental research, the group also has frequent experimental collaborations in the field of quantum optics, with the groups of Rupert Ursin and Anton Zeilinger at IQOQI-Vienna and with many other groups abroad.