1. Department of Electrical Engineering, City University of Hong Kong, Kowloon, Hong Kong 999077, China
2. Centre for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Kowloon, Hong Kong 999077, China
3. The State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong, Kowloon, Hong Kong 999077, China
4. Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, China
5. IAS Center for Quantum Technologies, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong 999077, China
6. Department of Physics, Faculty of Science, Department of Electrical and Electronic Engineering, University of Hong Kong, Hong Kong 999077, China