Frequency ratio of two optical clock transitions in ${}^{171}$Yb${}^{+}$ and constraints on the time-variation of fundamental constants

Abstract

Singly-ionized ytterbium, with ultra-narrow optical clock transitions at 467 nm and 436 nm, is a convenient system for the realization of optical atomic clocks and tests of present-day variation of fundamental constants. We present the first direct measurement of the frequency ratio of these two clock transitions, without reference to a cesium primary standard, and using the same single ion of 171Yb+. The absolute frequencies of both transitions are also presented, each with a relative standard uncertainty of $6\times 10^{-16}$. Combining our results with those from other experiments, we report a three-fold improvement in the constraint on the time-variation of the proton-to-electron mass ratio, $\dot{\mu }/\mu =0.2(1.1)\times 10^{-16}$ year${}^{-1}$, along with an improved constraint on time-variation of the fine structure constant, $\dot{\alpha }/\alpha =-0.7(2.1)\times 10^{-17}$ year${}^{-1}$.

arXiv comment6 pages, 4 figures. Additional citations and minor changes after peer review

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