1. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, P. R. China
2. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, P. R. China
3. PolySense Lab—Dipartimento Interateneo di Fisica, University and Politecnico of Bari, Via Amendola 173, Bari, Italy
4. Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, United States