${}^{115}$In${}^{+}$-${}^{172}$Yb${}^{+}$ Coulomb crystal clock with $2.5\times 10^{-18}$ systematic uncertainty

H. N. Hausser, J. Keller, T. Nordmann +17

We present a scalable mixed-species Coulomb crystal clock based on the ${}^1{S}_0$ $\leftrightarrow$ ${}^3{P}_0$ transition in ${}^{115}$In${}^{+}$. ${}^{172}$Yb${}^{+}$ ions are co-trapped and used f…