1. Institute of Physics and University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
2. CAS Centre for Excellence in Topological Quantum Computation, Chinese Academy of Sciences, Beijing 100190, China
3. Department of Physics and Astronomy & Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, Tennessee 37235, United States
4. Key Laboratory for Vacuum Physics, Chinese Academy of Sciences, Beijing 100049, China
5. Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China