1. Istituto di Fotonica e Nanotecnologie-Consiglio Nazionale delle Ricerche (IFN-CNR) and Dipartimento di Fisica-Politecnico di Milano, Piazza Leonardo da Vinci 32, Milano 20133, Italy
2. Institute for Quantum Science and Technology, University of Calgary, Calgary, Alberta T2N 1N4, Canada
3. School of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, United Kingdom
4. School of Engineering, Cardiff University, Cardiff CF24 3AA, United Kingdom
5. Department of Materials Physics–Complutense University of Madrid, Ciudad Universitaria, 28040-Madrid, Spain
6. Department of Mechanical Engineering, School of Engineering, University of Tokyo, Tokyo 113-8656, Japan
7. Department of Physics and “Nanostructured Interfaces and Surfaces” Inter-Departmental Centre, University of Torino, I-10125 Torino, Italy
8. Istituto di Fotonica e Nanotecnologie–Consiglio Nazionale delle Ricerche (CNR-IFN), Department of Science and High Technology, Università degli Studi dell'Insubria, Via Valleggio 11, 22100 Como, Italy
9. Istituto di Fotonica e Nanotecnologie, CNR, L-NESS, Via Anzani 42, 22100 Como, Italy
10. Istituto Italiano di Tecnologia, Center for Sustainable Future Technologies, via Livorno 60, 10144 Torino, Italy
11. University of Torino, Molecular Biology Center, via Nizza 52, 10126 Torino, Italy
12. Institute for Quantum Optics, Ulm University, D-89081 Ulm, Germany
13. Center for Integrated Quantum Science and Technology (IQst), Ulm University, D-89081 Ulm, Germany