1. Department of Precision Instrument, Tsinghua University, Beijing 100084, China
2. State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China
3. Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
4. School of Instrument Science and Optoelectronic Engineering, Beijing Information Science and Technology University, Beijing 100016, China