Absolute frequency measurement of a Yb optical clock at the limit of the Cs fountain

Abstract

We present the new absolute frequency measurement of ytterbium (171Yb) obtained at INRiM with the optical lattice clock IT-Yb1 against the cryogenic caesium (133Cs) fountain IT-CsF2, evaluated through a measurement campaign that lasted 14 months. Measurements are performed by either using a hydrogen maser as a transfer oscillator or by synthesizing a low-noise microwave for Cs interrogation using an optical frequency comb. The frequency of the 171Yb unperturbed clock transition 1S0 - 3P0 results to be 518 295 836 590 863.44(14) Hz, with a total fractional uncertainty of 2.7e-16 that is limited by the uncertainty of IT-CsF2. Our measurement is in agreement with the Yb frequency recommended by the Consultative Committee for Time and Frequency (CCTF). This result confirms the reliability of Yb as a secondary representation of the second and is relevant to the process of redefining the second in the International System of Units (SI) on an optical transition

References in corpus (32)

• Atomic clock performance beyond the geodetic limit
• An ${}^{27}$Al${}^{+}$ quantum-logic clock with systematic uncertainty below $10^{-18}$
• Geodesy and metrology with a transportable optical clock
• Optical clock comparison test of Lorentz symmetry
• Progress in Atomic Fountains at LNE-SYRTE
• Improved limits for violations of local position invariance from atomic clock comparisons
• Ultra-low noise microwave generation with fiber-based optical frequency comb and application to atomic fountain clock
• Trapped-ion probing of light-induced charging effects on dielectrics
• Advances in the accuracy, stability, and reliability of the PTB primary fountain clocks
• Improved accuracy of the NPL-CsF2 primary frequency standard: evaluation of distributed cavity phase and microwave lensing frequency shifts
• High accuracy measure of atomic polarizability in an optical lattice clock
• Hyperpolarizability and operational magic wavelength in an optical lattice clock
• One-Dimensional Optical Lattice Clock with a Fermionic 171Yb Isotope
• First international comparison of fountain primary frequency standards via a long distance optical fiber link
• Contributing to TAI with a Secondary Representation of the SI Second
• Observation and cancellation of the dc Stark shift in strontium optical lattice clocks
• Search for ultralight dark matter from long-term frequency comparisons of optical and microwave atomic clocks
• Long term measurement of the ${}^{87}$Sr clock frequency at the limit of primary Cs clocks
• Absolute frequency measurement of the 1S0 - 3P0 transition of 171Yb
• On a definition of the SI second with a set of optical clock transitions
• Least-squares analysis of clock frequency comparison data to deduce optimized frequency and frequency ratio values
• Improved Absolute Frequency Measurement of the 171Yb Optical Lattice Clock at KRISS Relative to the SI Second
• Absolute frequency measurement of the 171Yb optical lattice clock at KRISS using TAI for over a year
• Optical Stabilization of a Microwave Oscillator for Fountain Clock Interrogation
• Demonstration of the nearly continuous operation of an ${}^{171}$Yb optical lattice clock for half a year
• Modeling light shifts in optical lattice clocks
• Long-term drifts of stray electric fields in a Paul trap
• Absolute frequency of ${}^{87}\mathrm{Sr}$ at $1.8\times 10^{-16}$ uncertainty by reference to remote Primary Frequency Standards
• Limits on gravitational Einstein Equivalence Principle violation from monitoring atomic clock frequencies during a year
• Modeling motional energy spectra and lattice light shifts in optical lattice clocks
• High-Accuracy Determination of Paul-Trap Stability Parameters for Electric-Quadrupole-Shift Prediction
• Universal formalism for data sharing and processing in clock comparison networks

Cited by in corpus (6)

• Coordinated international comparisons between optical clocks connected via fiber and satellite links
• Constraints on violation of Lorentz symmetry with clock-comparison redshift experiments
• Improved absolute frequency measurement of ${}^{171}$Yb at NMIJ with uncertainty below $2\times 10^{-16}$
• A High-frequency Geodetic VLBI Experiment for Optical Clock Comparison
• International Optical Clock Comparison Using the European Optical Fiber Network
• The ultimate bounds to precision of atomic clock frequency measurement techniques