1. State Key Laboratory for Superlattices and MicrostructuresInstitute of SemiconductorsChinese Academy of Sciences Beijing 100083 China
2. Center of Materials Science and Optoelectronic EngineeringUniversity of Chinese Academy of Sciences Beijing 100049 China
3. Beijing Academy of Quantum Information Sciences Beijing 100193 China
4. School of Physics and AstronomyUniversity of Nottingham NG7 2RD Nottingham UK
5. Center for Excellence in Topological Quantum ComputationUniversity of Chinese Academy of Sciences Beijing 100049 China