Improved systematic uncertainty evaluation of the 171Yb optical lattice clock NMIJ-Yb1 with uncertainty of 2.6×10−17
Abstract
We report a systematic uncertainty evaluation of the 171Yb optical lattice clock NMIJ-Yb1 (NMIJ: National Metrology Institute of Japan) with a fractional frequency uncertainty of 2.6×10−17, improved by a factor of 3.8 compared with our previous uncertainty. The uncertainty of the lattice light shift is reduced to 1.6×10−17 by preparing axially sideband-cooled atoms in a shallow optical lattice. Different models to calculate the lattice light shift are compared, taking account of possible model-dependent biases due to the treatment of the radial motion of atoms trapped in the optical lattice. The uncertainty of the blackbody radiation shift reaches 7.0×10−18 by measuring the radiative temperature at the position of atoms with an in-vacuum temperature sensor. We also demonstrate the nearly continuous operation of NMIJ-Yb1 with an uptime of 91.3 % for 10 days, showing the potential for future improvement of the calibration uncertainty of International Atomic Time.
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BibTeX
@misc{kobayashi2026improved,
title = {{Improved systematic uncertainty evaluation of the $^171$Yb optical lattice clock NMIJ-Yb1 with uncertainty of $2.6\times10^-17$}},
author = {Takumi Kobayashi and Akiko Nishiyama and Ikuhiko Saito and Daisuke Akamatsu and Akio Kawasaki and Shintaro Nagase and Masami Yasuda},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.18468},
eprint = {2609.18468},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.18468},
}
RIS
TY - UNPB
TI - Improved systematic uncertainty evaluation of the ^171Yb optical lattice clock NMIJ-Yb1 with uncertainty of 2.6×10^−17
AU - Takumi Kobayashi
AU - Akiko Nishiyama
AU - Ikuhiko Saito
AU - Daisuke Akamatsu
AU - Akio Kawasaki
AU - Shintaro Nagase
AU - Masami Yasuda
PY - 2026
DA - 2026/09/16
PB - arXiv
DO - 10.48550/arxiv.2609.18468
UR - https://arxiv.org/abs/2609.18468
AB - We report a systematic uncertainty evaluation of the ^171Yb optical lattice clock NMIJ-Yb1 (NMIJ: National Metrology Institute of Japan) with a fractional frequency uncertainty of 2.6×10^−17, improved by a factor of 3.8 compared with our previous uncertainty. The uncertainty of the lattice light shift is reduced to 1.6×10^−17 by preparing axially sideband-cooled atoms in a shallow optical lattice. Different models to calculate the lattice light shift are compared, taking account of possible model-dependent biases due to the treatment of the radial motion of atoms trapped in the optical lattice. The uncertainty of the blackbody radiation shift reaches 7.0×10^−18 by measuring the radiative temperature at the position of atoms with an in-vacuum temperature sensor. We also demonstrate the nearly continuous operation of NMIJ-Yb1 with an uptime of 91.3 % for 10 days, showing the potential for future improvement of the calibration uncertainty of International Atomic Time.
ER -