1. Department of Physics, Harvard University, Cambridge, MA 02138, USA.
2. AWS Center for Quantum Networking, Boston, MA 02210, USA.
3. John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.
4. QuTech, Delft University of Technology, 2600 GA Delft, Netherlands.
5. Kavli Institute of Nanoscience Delft, Delft University of Technology, 2600 GA Delft, Netherlands.
6. Institut für Laserphysik und Zentrum für Optische Quantentechnologien, Universität Hamburg, 22761 Hamburg, Germany.
7. The Hamburg Centre for Ultrafast Imaging, 22761 Hamburg, Germany.
8. Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA.