science1 publisher
Two lutetium ion clocks agree at 5.7 parts in 10^19 after 200 hours of averaging
Each 176Lu+ reference has an evaluated systematic uncertainty near 1 x 10^-19, and the direct comparison between them resolves any difference only to 5.7 x 10^-19, six times coarser than the budget under test.
Publishers:nature.com
Reality
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