1. Center for Quantum Technology Research and Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements (MOE), School of Physics Beijing Institute of Technology Beijing 100081 China
2. Max‐Planck‐Institut für Quantenoptik Garching 85748 Germany
3. Munich Center for Quantum Science and Technology München 80799 Germany
4. Beijing Academy of Quantum Information Sciences Beijing 100193 China