1. Joint Quantum Institute, NIST/University of Maryland, College Park, Maryland20742, United States
2. ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels
(Barcelona) 08860, Spain
3. DIPC─Donostia International Physics Center, San Sebastian20018, Spain
4. Ikerbasque─Basque Foundation for Science, Bilbao48013, Spain
5. L-NESS, Department of Physics, Politecnico di Milano, Via Anzani 42, 22100Como, Italy
6. National Institute of Standards and Technology, Gaithersburg, Maryland20878, United States
7. National Institute for Materials Science, 1-1 Namiki, 305-0044Tsukuba, Japan
8. Joint Center for Quantum Information and Computer Science, NIST/University of Maryland, College Park, Maryland20742, United States
9. IREAP, University of Maryland, College Park, Maryland20742, United States
10. Department of Physics and IPAS, University of Adelaide, Adelaide, South Australia5005, Australia