1. Departments of Chemistry, and Physics and Astronomy University of Southern California Los Angeles CA 90089 USA
2. Department of Mechanical Engineering and Materials Science University of Pittsburgh Pittsburgh PA 15261 USA
3. ICQD/Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics University of Science and Technology of China Hefei Anhui 230026 China
4. Department of Physics and Astronomy University of Pittsburgh Pittsburgh PA 15260 USA
5. Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China