A clock network for geodesy and fundamental science
Abstract
Leveraging the unrivaled performance of optical clocks in applications in fundamental physics beyond the standard model, in geo-sciences, and in astronomy requires comparing the frequency of distant optical clocks truthfully. Meeting this requirement, we report on the first comparison and agreement of fully independent optical clocks separated by 700 km being only limited by the uncertainties of the clocks themselves. This is achieved by a phase-coherent optical frequency transfer via a 1415 km long telecom fiber link that enables substantially better precision than classical means of frequency transfer. The fractional precision in comparing the optical clocks of three parts in was reached after only 1000 s averaging time, which is already 10 times better and more than four orders of magnitude faster than with any other existing frequency transfer method. 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.
Cite
@article{arxiv.1511.07735,
title = {A clock network for geodesy and fundamental science},
author = {C. Lisdat and G. Grosche and N. Quintin and C. Shi and S. M. F. Raupach and C. Grebing and D. Nicolodi and F. Stefani and A. Al-Masoudi and S. Dörscher and S. Häfner and J. -L. Robyr and N. Chiodo and S. Bilicki and E. Bookjans and A. Koczwara and S. Koke and A. Kuhl and F. Wiotte and F. Meynadier and E. Camisard and M. Abgrall and M. Lours and T. Legero and H. Schnatz and U. Sterr and H. Denker and C. Chardonnet and Y. Le Coq and G. Santarelli and A. Amy-Klein and R. Le Targat and J. Lodewyck and O. Lopez and P. -E. Pottie},
journal= {arXiv preprint arXiv:1511.07735},
year = {2016}
}
Comments
14 pages, 3 figures, 1 table