학술논문
Developments of optical frequency standards at NICT and all-optical comparison against a remote clock in University of Tokyo using 60km fiber link
Document Type
Conference
Author
Source
2011 XXXth URSI General Assembly and Scientific Symposium General Assembly and Scientific Symposium, 2011 XXXth URSI. :1-4 Aug, 2011
Subject
Language
Abstract
At National Institute of Information and Communications Technology (NICT), we have lately developed a lattice clock using 87 Sr atoms as well as a single ion clock based on 40 Ca + . Besides the comparison of the two atomic standards inside the institute, all-optical fiber-link to transfer frequency standards to the University of Tokyo (UT) has been developed to evaluate the uncertainty and stability of our standards by referring the state-of-the-art lattice clock locating in UT. The initial evaluations have resulted in the relative stability of 10 −16 level, clearly showing the differential frequency of 4–5Hz mainly caused by the 45m difference of the elevation.