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Frequency ratio of an ¹¹⁵In⁺ ion clock and a ⁸⁷Sr optical lattice clock

Frequency ratio of an ¹¹⁵In⁺ ion clock and a ⁸⁷Sr optical lattice clock

We report on the first, to the best of our knowledge, frequency ratio measurement of an 115In+ singleion clock and a 87Sr 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 …