1. Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026, People’s Republic of China.
2. Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China.
3. Department of Physics, South University of Science and Technology of China, Shenzhen 518055, People’s Republic of China.
4. Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 10084, People’s Republic of China.
5. Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA.