1. Barcelona Institute of Science and Technology, Institute for Bioengineering of Catalonia, Barcelona 08028, Spain
2. GSI Helmholtzzentrum für Schwerionenforschung, Helmholtz-Institut Mainz, Mainz 55128, Germany
3. Institute for Physics, Johannes Gutenberg-Universität Mainz, Mainz 55099, Germany
4. Department of Molecular Biotechnology and Health Sciences, Center of Molecular Imaging, University of Turin, Turin 10126, Italy
5. Institute of Biostructures and Bioimaging, National Research Council of Italy, Turin 10126, Italy
6. School of Chemistry, University of Southampton, Southampton SO17 1BJ, U.K.
7. The Barcelona Institute of Science and Technology, ICFO─Institut de Ciéncies Fotóniques, Castelldefels, Barcelona 08860, Spain
8. Department of Physics, University of California at Berkeley, Berkeley, California 94720, United States
9. Quantum Technology Center, University of Maryland, College Park, Maryland 20742, United States