1. Department of Physics University of Tokyo Hongo, Bunkyo‐ku Tokyo 113‐0033 Japan
2. Institute for Solid State Physics University of Tokyo Kashiwa 277‐8581 Japan
3. CREST Japan Science and Technology Agency (JST) 4‐1‐8 Honcho Kawaguchi Saitama 332‐0012 Japan
4. School of Physics Southeast University Nanjing 211189 China
5. Trans‐scale Quantum Science Institute University of Tokyo Hongo, Bunkyo‐ku Tokyo 113‐0033 Japan