Coherent excitation of the highly forbidden electric octupole transition in ${}^{172}$Yb${}^{+}$

Abstract

We report on the first coherent excitation of the highly forbidden ${}^2{S}_{1/2}\to {}^2{F}_{7/2}$ electric octupole (E3) transition in a single trapped ${}^{172}$Yb${}^{+}$ ion, an isotope without nuclear spin. Using the transition in ${}^{171}$Yb${}^{+}$ as a reference, we determine the transition frequency to be $642116784950887.6(2.4)$Hz. We map out the magnetic field environment using the forbidden ${}^2{S}_{1/2}\to {}^2{D}_{5/2}$ electric quadrupole (E2) transition and determine its frequency to be $729476867027206.8(4.4)$Hz. Our results are a factor of $1\times 10^5$ ($3\times 10^5$) more accurate for the E2 (E3) transition compared to previous measurements. The results open up the way to search for new physics via precise isotope shift measurements and improved tests of local Lorentz invariance using the metastable ${}^2{F}_{7/2}$ state of Yb${}^{+}$.

arXiv comment6 pages, 5 figures

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