1Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
2Department of Physics and Center for Optoelectronics and Photonics Paderborn (CeOPP), Paderborn University, Warburger Strasse 100, 33098 Paderborn, Germany
3Institute for Photonic Quantum Systems (PhoQS), Paderborn University, 33098 Paderborn, Germany
4Faculty of Physics and Astronomy, Experimental Physics VI, Ruhr University Bochum, Universitätsstrasse 150, 44801 Bochum, Germany
5Wyant College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA
Nils Heinisch, Francesco Salusti, Mark R. Hogg, Timon L. Baltisberger, Malwina A. Marczak, Sascha R. Valentin, Arne Ludwig, Klaus D. Jöns, Richard J. Warburton, and Stefan Schumacher