Abstract

We report on the first, to the best of our knowledge, frequency ratio measurement of an $^{115}{\rm{I}}{{\rm{n}}^ +}$ single-ion clock and a $^{87}{\rm{Sr}}$ optical lattice clock. A hydrogen maser serves as a flywheel oscillator to measure the ratio by independent optical combs. From 89,000 s of measurement time, the frequency ratio ${f_{{\rm{In}}}}/\!{f_{{\rm{Sr}}}}$ is determined to be 2.952 748 749 874 863 3(23) with $7.7 \times {{1}}{{{0}}^{- 16}}$ relative uncertainty. The measurement creates a new connection in the network of frequency ratios of optical clocks.

© 2020 Optical Society of America

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