1. Center for Quantum Information and Quantum Biology, Osaka University, Toyonaka, Osaka 560-0043, Japan
2. Department of Physical Science, Aoyama Gakuin University, Sagamihara, Kanagawa 252-5258, Japan
3. Department of Materials Science and Technology, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan
4. Department of Applied Physics, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan