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.

arXiv comment8 pages, 6 figures, 1 table

References in corpus (24)

• An Optical Lattice Clock with Accuracy and Stability at the $10^{-18}$ Level
• Frequency Comparison of Two High-Accuracy Al+ Optical Clocks
• Systematic evaluation of an atomic clock at 2e-18 total uncertainty
• Atomic clock performance beyond the geodetic limit
• An ${}^{27}$Al${}^{+}$ quantum-logic clock with systematic uncertainty below $10^{-18}$
• Single-Ion Atomic Clock with $3\times 10^{-18}$ Systematic Uncertainty
• Geodesy and metrology with a transportable optical clock
• A clock network for geodesy and fundamental science
• JILA SrI Optical Lattice Clock with Uncertainty of $2.0\times 10^{-18}$
• Progress in Atomic Fountains at LNE-SYRTE
• A transportable optical lattice clock with $7\times 10^{-17}$ uncertainty
• Frequency ratio of Yb and Sr clocks with $5\times 10^{-17}$ uncertainty at 150 s averaging time
• High accuracy correction of blackbody radiation shift in an optical lattice clock
• Advances in the accuracy, stability, and reliability of the PTB primary fountain clocks
• Probing Interactions between Ultracold Fermions
• Operational Magic Intensity for Sr Optical Lattice Clocks
• Frequency ratios of Sr, Yb and Hg based optical lattice clocks and their applications
• Spectroscopy and frequency measurement of the ${}^{87}$Sr clock transition by laser linewidth transfer using an optical frequency comb
• Frequency ratio measurement of 171Yb and 87Sr optical lattice clocks
• Least-squares analysis of clock frequency comparison data to deduce optimized frequency and frequency ratio values
• Demonstration of the nearly continuous operation of an ${}^{171}$Yb optical lattice clock for half a year
• Improved frequency measurement of the ${}^1{S}_0$-${}^3{P}_0$ clock transition in ${}^{87}$Sr using the Cs fountain clock at NMIJ as a transfer oscillator
• Uncertainty evaluation of an ${}^{171}$Yb optical lattice clock at NMIJ
• Dual-Mode Operation of an Optical Lattice Clock Using Strontium and Ytterbium Atoms

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 $2\times 10^{-16}$