1. Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada.
2. Laboratoire de Nanotechnologie et d’Instrumentation Optique, Université de Technologie de Troyes, 12 rue Marie Curie, 10 000 Troyes, France.
3. Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Ontario N2L 2Y5, Canada.
4. Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria.