K. J. Arnold

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physics.atom-ph2025

Optical clocks with accuracy validated at the 19th digit

K. J. Arnold, M. D. K. Lee, Zhao Qi +4

We report a comprehensive evaluation of all known sources of systematic uncertainty for two independent $^{176}$ Lu $^{+}$ single-ion optical references, finding total systematic uncer…

physics.atom-ph2025

Precision measurement of the $^{176} Lu^{+}$ $^{3} D_{1}$ microwave clock transitions

M. D. K. Lee, Qi Zhao, Qin Qichen +4

We report precision measurement of the unperturbed $^{3} D_{1}$ microwave transition frequencies in $^{176} Lu^{+}$ to a fractional uncertainty of $4 \times 1 0^{- 14}$ . We find t…

physics.atom-ph2025

Absolute frequency measurement of a Lu $^{+}$ $(^{3} D_{1})$ optical frequency standard via link to international atomic time

Zhao Zhang, Qi Zhao, Qin Qichen +4

We report on an absolute frequency measurement of the $Lu^{+} (^{3} D_{1})$ standard frequency which is defined as the hyperfine-average of $^{1} S_{0}$ to $^{3} D_{1}$ o…

physics.atom-ph2024

An extrapolation method for polarizability assessments of ion-based optical clocks

K. J. Arnold, M. D. Barrett

We present a numerical method for extrapolating polarizability measurements to dc as done in the assessment of blackbody radiation shifts for ion-based clocks. The method explicitl…

Optical clocks with accuracy validated at the 19th digit

Precision measurement of the 176Lu+ 3D1​ microwave clock transitions

Absolute frequency measurement of a Lu+ (3D1​) optical frequency standard via link to international atomic time

An extrapolation method for polarizability assessments of ion-based optical clocks

Precision measurement of the $^{176} Lu^{+}$ $^{3} D_{1}$ microwave clock transitions

Absolute frequency measurement of a Lu $^{+}$ $(^{3} D_{1})$ optical frequency standard via link to international atomic time