Frequency ratio of an ${}^{115}$In${}^{+}$ ion clock and a ${}^{87}$Sr optical lattice clock

Nozomi Ohtsubo, Ying Li, Nils Nemitz +4

We report on the first frequency ratio measurement of an ${}^{115}$In+ single ion clock and a ${}^{87}$Sr optical lattice clock. A hydrogen maser serves as a reference oscillator to me…