Improved absolute frequency measurement of ${}^{171}$Yb at NMIJ with uncertainty below $2\times 10^{-16}$

Takumi Kobayashi, Akiko Nishiyama, Kazumoto Hosaka +6

We report improved absolute frequency measurement of the ${}^1$S${}_0{-}^3$P${}_0$ transition of ${}^{171}$Yb at National Metrology Institute of Japan (NMIJ) by comparing the $^{171}…