1. Key Laboratory of Ultra‐Weak Magnetic Field Measurement Technology, Ministry of Education, School of Instrumentation and Optoelectronic Engineering Beihang University Beijing 100191 China
2. Hangzhou Innovation Institute Beihang University Hangzhou 310052 China
3. Hefei National Laboratory Hefei 230088 China
4. National Institute of Extremely‐Weak Magnetic Field Infrastructure Hangzhou 310051 China