1. State Key Laboratory of Precision Measurement Technology and InstrumentsDepartment of Precision InstrumentsTsinghua University Beijing 100084 China
2. State Key Laboratory of Low‐Dimensional Quantum PhysicsDepartment of Physics & Tsinghua‐Foxconn Nanotechnology Research CenterTsinghua University & Collaborative Innovation Center of Quantum Matter Beijing 100084 China
3. Department of AutomationTsinghua University Beijing 100084 China