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Yb/Sr optical clock comparison at 2.2E-18 uncertainty over a 1350-km fiber link

Hou, Lei et al.
arXiv (All) · Papers
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atomic-physicsoptics
Redefining the International system of Units (SI) second requires independent frequency-ratio measurements between clocks based on different laboratories, with an overall uncertainty below 5E-18, to validate individual clock evaluations through consistency checks. Reaching this uncertainty over long
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