2025-06-14 フィンランド技術研究センター（VTT）
＜関連情報＞
- https://www.vttresearch.com/en/news-and-ideas/towards-redefining-second-optical-atomic-clocks
- https://opg.optica.org/optica/fulltext.cfm?uri=optica-12-6-843&id=572911
光ファイバーと衛星回線で接続された光時計の国際比較の調整 Coordinated international comparisons between optical clocks connected via fiber and satellite links
Thomas Lindvall, Marco Pizzocaro, Rachel M. Godun, Michel Abgrall, Daisuke Akamatsu, Anne Amy-Klein, Erik Benkler, Nishant M. Bhatt, Davide Calonico, Etienne Cantin, Elena Cantoni, Giancarlo Cerretto, Christian Chardonnet, Miguel Angel Cifuentes Marin, Cecilia Clivati, Stefano Condio, E. Anne Curtis, Heiner Denker, Simone Donadello, Sören Dörscher, Chen-Hao Feng, Melina Filzinger, Thomas Fordell, Irene Goti, Kalle Hanhijärvi, H. Nimrod Hausser, Ian R. Hill, Kazumoto Hosaka, Nils Huntemann, Matthew Y. H. Johnson, et al.
Optica Published: June 12, 2025
DOI:https://doi.org/10.1364/OPTICA.561754
Abstract
Optical clocks provide ultraprecise 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 to our knowledge, while others had significantly lower uncertainties than previously achieved, supporting the advance toward a redefinition of the second and the use of optical standards for international time scales.
