1. Instituto Superior Técnico, University of Lisbon 1 , Lisbon 1049-001, Portugal
2. Instituto de Telecomunicações 2 , Lisbon 1049-001, Portugal
3. Department of Physics, School of Science and Technology, University of Siegen 3 , 57068 Siegen, Germany
4. Department of Physics and Astronomy, University College London 4 , London WC1E 6BT, United Kingdom
5. Physics of Information and Quantum Technologies Group, Center of Physics and Engineering of Advanced Materials (CeFEMA) 5 , Lisbon 1049-001, Portugal
6. PQI—Portuguese Quantum Institute 6 , Lisbon 1600-531, Portugal