Roadmap towards the redefinition of the second

Published

January 22, 2024

Author(s)

C Rieck, T Ido, M Wouters, Y Hanado, M Fujieda, PO Hedekvist, PE Pottie, J Bartholomew, J Hanssen, A Malimon, N Ashby, P Defraigne, Elizabeth Donley, I Sesia, H Schnatz, P Dube, N Dimarc, F Levi, H Margolis, S Slyusarev, M Yasuda, S Bize, D Calonico, David B. Newell, JP Uzan, M Gertsvolf, C Oates, E Peik, S Weyers, DH Yu, G Mileti, P Tavella, F Meynadier, G Petit, G Panfilo, F Fang, J Lodewyck

Abstract

This paper outlines the roadmap towards the redefinition of the second recently updated by the CCTF Task Force created by the CCTF in 2020. The main achievements and the open challenges related to the status of the optical frequency standards, their contribution to time scales and UTC, the possibility of their comparison and the knowledge of the Earth gravitational potential at the necessary level of uncertainty are discussed. Also, the mandatory criteria to be achieved before redefinition and their current fulfillment level, together with the redefinition options based on a single or on a set of transitions are described.

Citation

Metrologia

Volume

61

Pub Type

Journals

Download Paper

https://doi.org/10.1088/1681-7575/ad17d2

Local Download

Keywords

Time and Frequency Metrology, Optical Clocks, Redefinition, International System of Units

Citation

Rieck, C. , Ido, T. , Wouters, M. , Hanado, Y. , Fujieda, M. , Hedekvist, P. , Pottie, P. , Bartholomew, J. , Hanssen, J. , Malimon, A. , Ashby, N. , Defraigne, P. , Donley, E. , Sesia, I. , Schnatz, H. , Dube, P. , Dimarc, N. , Levi, F. , Margolis, H. , Slyusarev, S. , Yasuda, M. , Bize, S. , Calonico, D. , Newell, D. , Uzan, J. , Gertsvolf, M. , Oates, C. , Peik, E. , Weyers, S. , Yu, D. , Mileti, G. , Tavella, P. , Meynadier, F. , Petit, G. , Panfilo, G. , Fang, F. and Lodewyck, J. (2024), Roadmap towards the redefinition of the second, Metrologia, [online], https://doi.org/10.1088/1681-7575/ad17d2, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=956321 (Accessed October 14, 2025)