1. Department of Physics, Princeton University, Princeton, New Jersey 08544, United States
2. Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, United States
3. Department of Mathematics, University of California, Los Angeles, California 90095, United States
4. Center for Quantum Science and Engineering, University of California, Los Angeles, California 90095, United States
5. Department of Physics, University of Washington, 98195 Seattle, Washington United States
6. Department of Materials Science and Engineering, University of Washington, 98195 Seattle, Washington United States