1. State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
2. Beijing Academy of Quantum Information Sciences, Beijing 100193, China
3. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
4. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
5. Beijing National Research Center for Information Science and Technology and School of Information, Tsinghua University, Beijing 100084, China
6. Frontier Science Center for Quantum Information, Beijing 100084, China