1. Quantum Metrology Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
2. Space-Time Engineering Research Team, RIKEN, Wako, Saitama 351-0198, Japan
3. Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
4. Department of Applied Physics, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan