Direct Comparison of Distant Optical Lattice Clocks at the $10^{-16}$ Uncertainty

Fiber-based remote comparison of 87 Sr lattice clocks in 24 km distant laboratories is demonstrated. The instability of the comparison reaches $5\times 10^{-16}$ over an averaging time of 1000 s, which is two orders of magnitude shorter than that of conventional satellite links and is limited by the...

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Bibliographic Details
Published in:Applied physics express 2011-08, Vol.4 (8), p.082203-082203-3
Main Authors: Yamaguchi, Atsushi, Fujieda, Miho, Kumagai, Motohiro, Hachisu, Hidekazu, Nagano, Shigeo, Li, Ying, Ido, Tetsuya, Takano, Tetsushi, Takamoto, Masao, Katori, Hidetoshi
Format: Article
Language:English
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Summary:Fiber-based remote comparison of 87 Sr lattice clocks in 24 km distant laboratories is demonstrated. The instability of the comparison reaches $5\times 10^{-16}$ over an averaging time of 1000 s, which is two orders of magnitude shorter than that of conventional satellite links and is limited by the instabilities of the optical clocks. By correcting the systematic shifts that are predominated by the differential gravitational redshift, the residual fractional difference is found to be $(1.0\pm 7.3)\times 10^{-16}$, confirming the coincidence between the two clocks. The accurate and speedy comparison of distant optical clocks paves the way for a future optical redefinition of the second.
ISSN:1882-0778
1882-0786
DOI:10.1143/APEX.4.082203