Absolute frequency of $^{87}\mathrm{Sr}$ at $1.8 \times 10^{-16}$ uncertainty by reference to remote Primary Frequency Standards
Atomic Physics
2020-10-20 v1
Abstract
The optical lattice clock NICT-Sr1 regularly reports calibration measurements of the international timescale TAI. By comparing measurement results to the reports of eight Primary Frequency Standards, we find the absolute frequency of the clock transition to be f(Sr)=, with a fractional uncertainty of less than 1.8x10 approaching the systematic limits of the best realization of SI second. Our result is consistent with other recent measurements and further supported by the loop closure over the absolute frequencies of , and direct optical measurements of their ratio.
Keywords
Cite
@article{arxiv.2008.00723,
title = {Absolute frequency of $^{87}\mathrm{Sr}$ at $1.8 \times 10^{-16}$ uncertainty by reference to remote Primary Frequency Standards},
author = {Nils Nemitz and Tadahiro Gotoh and Fumimaru Nakagawa and Hiroyuki Ito and Yuko Hanado and Tetsuya Ido and Hidekazu Hachisu},
journal= {arXiv preprint arXiv:2008.00723},
year = {2020}
}
Comments
18 pages, 5 figures, 5 tables