${}^{176}$Lu${}^{+}$ clock comparison at the $10^{-18}$ level via correlation spectroscopy

Zhang Zhiqiang, Kyle J. Arnold, Rattakorn Kaewuam +1

We experimentally demonstrate agreement between two ${}^{176}$Lu${}^{+}$ frequency references using correlation spectroscopy. From a comparison at different magnetic fields, we obtain a…