[1] Natl Inst Adv Ind Sci & Technol, Device Technol Res Inst, Cent 2,1-1-1 Umezono, Tsukuba, Ibaraki 3058568, Japan
[2] Fujitsu Res, Quantum Lab, Nakahara Ku, 1-1 Kamikodanaka,4 Chome, Kawasaki, Kanagawa 2118588, Japan
[3] Yokohama Natl Univ, Sch Engn Sci, 79-5 Tokiwadai, Yokohama, Kanagawa 2408501, Japan