Vahid Ansari, ∗ John M. Donohue, † Markus Allgaier, Linda Sansoni, Benjamin Brecht, 2 Jonathan Roslund, Nicolas Treps, Georg Harder, and Christine Silberhorn Integrated Quantum Optics, Paderborn University, Warburger Strasse 100, 33098 Paderborn, Germany Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, OX1 3PU, United Kingdom Laboratoire Kastler Brossel, UPMC-Sorbo...
