Matthias Zens successfully defended his PhD on “Cavity Quantum Electrodynamics with Spin Ensembles: From the Semiclassical to the Quantum Regime” – congratulations! Many thanks also to Johannes Feist and Ulrich Hohenester for serving as external referees.
![](https://rottergroup.itp.tuwien.ac.at/wp-content/uploads/2021/10/matthias_phd.jpg)