Improved systematic evaluation of a strontium optical clock with uncertainty below $1\times 10^{-18}$

Zhi-Peng Jia, Jie Li, De-Quan Kong +17

We report a systematic uncertainty of $9.2\times 10^{-19}$ for the USTC Sr1 optical lattice clock, achieving accuracy at the level required for the roadmap of the redefinition of t…