Improved Frequency Ratio Measurement with 87Sr and 171Yb Optical Lattice Clocks at NMIJ

Abstract

We report improved frequency ratio measurement with ${}^{87}$Sr and ${}^{171}$Yb optical lattice clocks at the National Metrology Institute of Japan (NMIJ). The ${}^{87}$Sr optical lattice clock is enhanced with several major modifications and is re-evaluated with a reduced uncertainty of $1.1\times 10^{-16}$. We employed a ${}^{171}$Yb optical lattice clock with an uncertainty of $4\times 10^{-16}$ that was developed for contributing to International Atomic Time (TAI). The measurement result is ${\nu }_{\mathrm{Yb}}/{\nu }_{\mathrm{Sr}}$ = 1.207 507 039 343 338 58(49)${}_{\mathrm{sys}}$(6)${}_{\mathrm{stat}}$ with a fractional uncertainty of $4.1\times 10^{-16}$, which is 3.4 times smaller than our previous measurement result.

8 pages, 6 figures, 1 table

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Cited by in corpus (4)

• Absolute frequency measurement of the 171Yb optical lattice clock at KRISS using TAI for over a year
• Generation of a precise time scale assisted by a near-continuously operating optical lattice clock
• Accurate Determination of Blackbody Radiation Shifts in a Strontium Molecular Lattice Clock
• Improved absolute frequency measurement of ${}^{171}$Yb at NMIJ with uncertainty below $2\times 10^{-16}$