1. State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
2. Frontier Science Center for Quantum Information, Beijing, China
3. Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
4. Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel
5. Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) and Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, China
6. Institute for Advanced Study, Tsinghua University, Beijing 100084, China
7. Beijing Academy of Quantum Information Sciences, Beijing 100193, China