${}^{88}$Sr${}^{+}$ optical clock with $7.9\times 10^{-19}$ systematic uncertainty and measurement of its absolute frequency with $9.8\times 10^{-17}$ uncertainty

T. Lindvall, T. Fordell, K. J. Hanhijärvi +4

We report on a ${}^{88}$Sr${}^{+}$ single-ion optical clock with an estimated fractional systematic uncertainty of $7.9\times 10^{-19}$. The low uncertainty is enabled by small rf loss…