1. Quantum Research Centre, Anamdong, Seungbukgoo, Seoul (136-701), R.O. Korea, Information and Communications Engineering, Information Technology Division, Dongguk University, Seoul (100-715), R.O. Korea, School of Materials Science and Engineering, Hongik University, Chochiwon, Yungi-gun, Chungcheong-nam-do (339-701), R.O. Korea, and Laboratory of Superconducting Material Science, Department of Chemistry, Korea University, Seoul (136-701), R.O. Korea