1. Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
2. Danish Fundamental Metrology, Kogle Alle 5, 2970 Ho̷rsholm, Denmark
3. Catalan Institute of Nanoscience and Nanotechnology (ICN2),
CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain
4. Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, Building, Lyngby, 310, 2800 Denmark
5. NNF Quantum Computing Programme, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
6. ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Catalonia, Spain