1. Institute for Quantum Information & State Key Laboratory of High Performance ComputingCollege of ComputerNational University of Defense Technology Changsha 410073 China
2. Department of Materials Science and Engineering and Inter‐University Semiconductor Research CenterSeoul National University Seoul 151‐744 Republic of Korea
3. Department of Materials Science and EngineeringKorea Advanced Institute of Science and Technology Daejeon 34141 Republic of Korea