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
Abstract: | |
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 |
pos. | country | downloads | ||
---|---|---|---|---|
total | perc. | |||
1 | Germany | 136 | 58.37% | |
2 | United States | 35 | 15.02% | |
3 | China | 30 | 12.88% | |
4 | Netherlands | 8 | 3.43% | |
5 | Vietnam | 3 | 1.29% | |
6 | No geo information available | 3 | 1.29% | |
7 | Hong Kong | 3 | 1.29% | |
8 | France | 3 | 1.29% | |
9 | Singapore | 1 | 0.43% | |
10 | Russian Federation | 1 | 0.43% | |
other countries | 10 | 4.29% |
Hinweis
Zur Erhebung der Downloadstatistiken kommen entsprechend dem „COUNTER Code of Practice for e-Resources“ international anerkannte Regeln und Normen zur Anwendung. COUNTER ist eine internationale Non-Profit-Organisation, in der Bibliotheksverbände, Datenbankanbieter und Verlage gemeinsam an Standards zur Erhebung, Speicherung und Verarbeitung von Nutzungsdaten elektronischer Ressourcen arbeiten, welche so Objektivität und Vergleichbarkeit gewährleisten sollen. Es werden hierbei ausschließlich Zugriffe auf die entsprechenden Volltexte ausgewertet, keine Aufrufe der Website an sich.