1. Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA;
2. Joint Quantum Institute, Center for Quantum Information and Computer Science, Department of Physics, University of Maryland, College Park, Maryland 20742, USA;
3. Department of Physics, University of Maryland, College Park, Maryland 20742, USA
4. Microsoft Quantum, Station Q, Santa Barbara, California 93106-6105, USA;
5. Department of Physics, University of California, Santa Barbara, California 93106, USA
6. Department of Physics, University of California, Berkeley, California 94720, USA;
7. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA