1. Department of Electrical and Electronic Engineering Tokyo Institute of Technology Ookayama, Meguro-ku Tokyo 152-8550 Japan
2. Advanced Power Electronics Research Center National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba 305-8568 Japan
3. Takasaki Institute of Advanced Quantum Science National Institutes for Quantum Science and Technology (QST) Takasaki 370-1292 Japan
4. Advanced Research and Innovation Center DENSO CORPORATION Nisshin 470-0111 Japan