1. Thomas J. Watson, Sr., Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, United States
2. Kavli Nanoscience Institute, California Institute of Technology, Pasadena, California 91125, United States
3. Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, California 91125, United States
4. Department of Applied Physics and Material Science, California Institute of Technology, Pasadena, California 91125, United States
5. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
6. Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125, United States