A clock network for geodesy and fundamental science

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Lisdat, C.; Grosche, G.; Quintin, N.; Shi, C.; Raupach, S.M.F. et al.: A clock network for geodesy and fundamental science. In: Nature Communications 7 (2016),12443. DOI: http://dx.doi.org/10.1038/ncomms12443

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Sum total of downloads: 189

Leveraging the unrivalled performance of optical clocks as key tools for geo-science, for astronomy and for fundamental physics beyond the standard model requires comparing the frequency of distant optical clocks faithfully. Here, we report on the comparison and agreement of two strontium optical clocks at an uncertainty of 5 × 10−17 via a newly established phase-coherent frequency link connecting Paris and Braunschweig using 1,415 km of telecom fibre. The remote comparison is limited only by the instability and uncertainty of the strontium lattice clocks themselves, with negligible contributions from the optical frequency transfer. A fractional precision of 3 × 10−17 is reached after only 1,000 s averaging time, which is already 10 times better and more than four orders of magnitude faster than any previous long-distance clock comparison. The capability of performing high resolution international clock comparisons paves the way for a redefinition of the unit of time and an all-optical dissemination of the SI-second.
License of this version: CC BY 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2016
Appears in Collections:Fakultät für Bauingenieurwesen und Geodäsie

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pos. country downloads
total perc.
1 image of flag of Germany Germany 128 67.72%
2 image of flag of United States United States 22 11.64%
3 image of flag of China China 16 8.47%
4 image of flag of Netherlands Netherlands 5 2.65%
5 image of flag of Vietnam Vietnam 3 1.59%
6 image of flag of No geo information available No geo information available 3 1.59%
7 image of flag of France France 3 1.59%
8 image of flag of South Africa South Africa 1 0.53%
9 image of flag of Singapore Singapore 1 0.53%
10 image of flag of Belgium Belgium 1 0.53%
    other countries 6 3.17%

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