1. Department of Physics, Graduate School of Science, Kobe University, Kobe 657-8501, Japan
2. The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
3. Department of Physics, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
4. Institute for Physics of Intelligence, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
5. Trans-scale Quantum Science Institute, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
6. Institute of Physics, Slovak Academy of Sciences, Bratislava 845 11, Slovakia