Sympathetic ground state cooling and time-dilation shifts in an ${}^{27}{\text{Al}}^{+}$ optical clock

J. -S. Chen, S. M. Brewer, C. W. Chou +3

We report on Raman sideband cooling of ${}^{25}{\text{Mg}}^{+}$ to sympathetically cool the secular modes of motion in a ${}^{25}{\text{Mg}}^{+}$-${}^{27}{\text{Al}}^{+}$ two-ion pair to near th…