1. Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.
2. Physik-Department, Technische Universität München, 85748 Garching, Germany.
3. Department of Communications and Networking, Aalto University, 02150 Espoo, Finland.
4. RIKEN Center for Quantum Computing (RQC), Wako, Saitama 351-0198, Japan.
5. National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan.
6. Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan.
7. Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, 80799 Munich, Germany.