1. NTT Basic Research Laboratories,Nippon Telegraph and Telephone Corporation,Atsugi,Kanagawa,Japan,243-0198
2. Quantum Metrology Laboratory,RIKEN,Wako,Saitama,Japan,351-0198
3. Nippon Telegraph and Telephone Corporation,NTT Device Innovation Center,Atsugi,Kanagawa,Japan,243-0198
4. Nippon Telegraph and Telephone Corporation,NTT Device Technology Laboratories,Atsugi,Kanagawa,Japan,243-0198
5. Nippon Telegraph and Telephone Corporation,NTT Science and Core Technology Laboratory Group,Atsugi,Kanagawa,Japan,243-0198