1 Applied Physics Department, Royal Institute of Technology, Albanova University Centre, Roslagstullsbacken 21, 106 91, Stockholm, Sweden. klausj@kth.se.
2 Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628CJ, Delft, The Netherlands. klausj@kth.se.
3 Applied Physics Department, Royal Institute of Technology, Albanova University Centre, Roslagstullsbacken 21, 106 91, Stockholm, Sweden.
4 Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628CJ, Delft, The Netherlands.
5 Quantum optics, Quantum Nanophysics and Quantum Information, Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090, Vienna, Austria.
6 Institute for Quantum Optics and Quantum Information, Austrian Academy of Science, Boltzmanngasse 3, 1090, Vienna, Austria.
7 National Research Council of Canada, Ottawa, K1A 0R6, Canada.
8 Politecnico di Milano, Dipartimento di Elettronica Informazione e Bioingegneria, piazza Leonardo da Vinci 32, 20133, Milano, Italy.
9 Micro Photon Devices, via Stradivari 4, 39100, Bolzano, Italy.
10 Institute for Quantum Computing and Department of Electrical & Computer Engineering, University of Waterloo, Waterloo, N2L 3G1, Canada.