Author Affiliations

Takeshi Umeki,^1,2 Takushi Kazama,¹ Akihide Sano,^2,† Masashi Abe,^1,‡ Koji Enbutsu,¹ Takayuki Kobayashi,² Hirokazu Takenouchi,^1,2 Ryoichi Kasahara,¹ and Yutaka Miyamoto²

¹NTT Device Technology Labs., NTT Corporation, 3-1, Morinosato Wakamiya, Atsugi, Kanagawa, Japan

²NTT Network Innovation Labs., NTT Corporation, 1-1, Hikarinooka Yokosuka, Kanagawa, Japan

^†Currently with Department of Electrical and Electronic Engineering, College of Science and Engineering, Ritsumeikan University

^‡Currently with Department of Physics, Faculty of Science and Engineering, Chuo University