1. Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, China
2. National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures and College of Engineering and Applied Sciences, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, China
3. Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, USA