Coordinated international comparisons between optical clocks connected via fiber and satellite links
Abstract
Optical clocks provide ultra-precise frequency references that are vital for international metrology as well as for tests of fundamental physics. To investigate the level of agreement between different clocks, we simultaneously measured the frequency ratios between ten optical clocks in six different countries, using fiber and satellite links. This is the largest coordinated comparison to date, from which we present a subset of 38 optical frequency ratios and an evaluation of the correlations between them. Four ratios were measured directly for the first time, while others had significantly lower uncertainties than previously achieved, supporting the advance towards a redefinition of the second and the use of optical standards for international time scales.
Cite
@article{arxiv.2505.06763,
title = {Coordinated international comparisons between optical clocks connected via fiber and satellite links},
author = {Thomas Lindvall and Marco Pizzocaro and Rachel M. Godun and Michel Abgrall and Daisuke Akamatsu and Anne Amy-Klein and Erik Benkler and Nishant M. Bhatt and Davide Calonico and Etienne Cantin and Elena Cantoni and Giancarlo Cerretto and Christian Chardonnet and Miguel Angel Cifuentes Marin and Cecilia Clivati and Stefano Condio and E. Anne Curtis and Heiner Denker and Simone Donadello and Sören Dörscher and Chen-Hao Feng and Melina Filzinger and Thomas Fordell and Irene Goti and Kalle Hanhijärvi and H. Nimrod Hausser and Ian R. Hill and Kazumoto Hosaka and Nils Huntemann and Matthew Y. H. Johnson and Jonas Keller and Joshua Klose and Takumi Kobayashi and Sebastian Koke and Alexander Kuhl and Rodolphe Le Targat and Thomas Legero and Filippo Levi and Burghard Lipphardt and Christian Lisdat and Hongli Liu and Jérôme Lodewyck and Olivier Lopez and Maxime Mazouth-Laurol and Tanja E. Mehlstäubler and Alberto Mura and Akiko Nishiyama and Tabea Nordmann and Adam O. Parsons and Gérard Petit and Benjamin Pointard and Paul-Eric Pottie and Matias Risaro and Billy I. Robertson and Marco Schioppo and Haosen Shang and Kilian Stahl and Martin Steinel and Uwe Sterr and Alexandra Tofful and Mads Tønnes and Dang-Bao-An Tran and Jacob Tunesi and Anders E. Wallin and Helen S. Margolis},
journal= {arXiv preprint arXiv:2505.06763},
year = {2025}
}
Comments
25 pages, 6 figures