Zhao Qi

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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

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

Validating a lutetium frequency reference

Kyle J. Arnold, Scott Bustabad, Qin Qichen +3

We review our progress in developing a frequency reference with singly ionized lutetium and give estimates of the levels of inaccuracy we expect to achieve in the near future with…

Optical clocks with accuracy validated at the 19th digit

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

Validating a lutetium frequency reference

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