Absolute frequency measurement of the ${}^2$S${}_{1/2}{\to }^2$F${}_{7/2}$ optical clock transition in ${}^{171}$Yb${}^{+}$ with an uncertainty of $4\times 10^{-16}$ using a frequency link to International Atomic Time

Abstract

The highly forbidden ${}^2$S${}_{1/2}{\to }^2$F${}_{7/2}$ electric octupole transition in ${}^{171}$Yb${}^{+}$ is a potential candidate for a redefinition of the SI second. We present a measurement of the absolute frequency of this optical transition, performed using a frequency link to International Atomic Time to provide traceability to the SI second. The ${}^{171}$Yb${}^{+}$ optical frequency standard was operated for 76% of a 25-day period, with the absolute frequency measured to be 642 121 496 772 645.14(26) Hz. The fractional uncertainty of $4.0\times 10^{-16}$ is comparable to that of the best previously reported measurement, which was made by a direct comparison to local caesium primary frequency standards.

10 pages, 3 figures. Corrected typos - no changes to any numbers or results from version1

References in corpus (7)

• Systematic evaluation of an atomic clock at 2e-18 total uncertainty
• Frequency ratio of two optical clock transitions in ${}^{171}$Yb${}^{+}$ and constraints on the time-variation of fundamental constants
• Ultra-stable optical clock with two cold-atom ensembles
• Improved limit on a temporal variation of $m_p/m_e$ from comparisons of Yb${}^{+}$ and Cs atomic clocks
• Absolute frequency measurement of the 1S0 - 3P0 transition of 171Yb
• Evaluating the performance of the NPL femtosecond frequency combs: Agreement at the $10^{-21}$ level
• Absolute frequency measurement with uncertainty below $1\times 10^{-15}$ using International Atomic Time

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• Absolute frequency of ${}^{87}\mathrm{Sr}$ at $1.8\times 10^{-16}$ uncertainty by reference to remote Primary Frequency Standards
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• Generation of a precise time scale assisted by a near-continuously operating optical lattice clock
• Cold Beam Optical Clock with Multifrequency Spectroscopy
• Absolute frequency measurements with a robust, transportable ^{40}Ca^{+} optical clock
• Observation of the $4f^{14}6s^2{}^1{S}_0-4f^{13}5d6s^2(J=2)$ clock transition at 431 nm in ${}^{171}$Yb
• Combined two-loop self-energy corrections at finite and zero temperatures
• Nuclear spin quenching of the ${}^2{S}_{1/2}\to {}^2{F}_{7/2}$ electric octupole transition in ${}^{173}$Yb${}^{+}$