1. Center for Nanoscale Materials Argonne National Laboratory Lemont IL 60439 USA
2. Quantum Measurement Group Massachusetts Institute of Technology Cambridge MA 02139 USA
3. Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
4. Department of Physics University of Pennsylvania Philadelphia PA 19104 USA
5. John A. Paulson School of Engineering and Applied Sciences Harvard University Cambridge MA 02138 USA
6. Department of Physics Princeton University Princeton NJ 08544 USA
7. Donostia International Physics Center P. Manuel de Lardizabal 4 Donostia‐San Sebastian 20018 Spain
8. IKERBASQUE Basque Foundation for Science Plaza Euskadi 5 Bilbao 48009 Spain
9. Department of Nuclear Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
10. Advanced Photon Source Argonne National Laboratory Lemont IL 60439 USA
11. Department of Mathematics University of Wisconsin–Madison Madison WI 53706 USA
12. Computational Research Division Lawrence Berkeley Laboratory Berkeley CA 94720 USA