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

Abstract

We performed an absolute frequency measurement of the ${}^1{S}_0$-${}^3{P}_0$ transition in ${}^{87}$Sr with a fractional uncertainty of $1.2\times 10^{-15}$, which is less than one third that of our previous measurement. A caesium fountain atomic clock was used as a transfer oscillator to reduce the uncertainty of the link between a strontium optical lattice clock and the SI second. The absolute value of the transition frequency is 429 228 004 229 873.56(49) Hz.

accepted for publication in Journal of the Physical Society of Japan, 7 pages, 2 figures

References in corpus (2)

• Systematic evaluation of an atomic clock at 2e-18 total uncertainty
• One-Dimensional Optical Lattice Clock with a Fermionic 171Yb Isotope

Cited by in corpus (14)

• Geodesy and metrology with a transportable optical clock
• Atomic Clocks for Geodesy
• Realization of a time-scale with an accurate optical lattice clock
• Optical to microwave clock frequency ratios with a nearly continuous strontium optical lattice clock
• Long term measurement of the ${}^{87}$Sr clock frequency at the limit of primary Cs clocks
• Lorentz and CPT Tests with Clock-Comparison Experiments
• SI-traceable measurement of an optical frequency at low $10^{-16}$ level without a local primary standard
• A strontium optical lattice clock with $1\times 10^{-17}$ uncertainty and measurement of its absolute frequency
• Demonstration of the nearly continuous operation of an ${}^{171}$Yb optical lattice clock for half a year
• Absolute frequency measurement with uncertainty below $1\times 10^{-15}$ using International Atomic Time
• Absolute frequency of ${}^{87}\mathrm{Sr}$ at $1.8\times 10^{-16}$ uncertainty by reference to remote Primary Frequency Standards
• Uncertainty evaluation of an ${}^{171}$Yb optical lattice clock at NMIJ
• Improved Frequency Ratio Measurement with 87Sr and 171Yb Optical Lattice Clocks at NMIJ
• Dual-Mode Operation of an Optical Lattice Clock Using Strontium and Ytterbium Atoms