["The Bonn-Cologne Graduate School of Physics and Astronomy (BCGS) is a joint programme of graduate studies between the Universities of Bonn and Cologne. It was funded through the Excellence Initiative from 2007 to 2019.The PhD programme involves three years of research-oriented thesis work, leading to a doctoral degree in the field of physics. Scientific interests are centred on activities in applied and quantum optics, nuclear, and particle physics, physics of condensed matter, statistical physics, astroparticle physics, and mathematical physics."]