Margolis, H S; Godun, R M; Huntemann, N; le Targat, R; Pizzocaro, M; Zawada, M; Abgrall, M; Akamatsu, D; Alvarez Martinez, H; Amy-Klein, A; Andia, M; Benkler, E; Bhatt, N M; Bilicki, S; Bize, S; Bober, M; Calonico, D; Cambier, V; Cantin, E; Chardonnet, C; Cifuentes Marin, M; Clivati, C; Condio, S; Curtis, E A; Czubla, A; Dolezal, M; Doescher, S; Dunst, P; Feng, C-H; Filzinger, M; Folman, R; Fordell, T; Formichella, V; Foucault, Y; Galleani, L; Goti, I; Groswasser, D; Gruszczynski, M; Guo, C; Hanhijarvi, K J; Hausser, H N; Hill, I R; Hosaka, K; Johnson, M Y H; Keller, J; Klose, J; Kobayahi, T; Koke, S; Kovacic, D; Kren, P; Kuhl, A; Ledzinski, A; Lemanski, D; Levi, F; Lindvall, T; Lisdat, C; Liu, H; Lodewyck, J; Lopez, O; Lorini, L; Lours, M; Masika, P; Mazouth-Laurol, M; Mehlstaubler, T E; Moreno, W; Morzynski, A; Naroznik, M; Nawrocki, J; Nishiyama, A; Nogas, P; Nordmann, T; Parsons, A O; Pointard, B; Pottie, P E; Risaro, M; Robertson, B I; Romero Gonzalez, J; Schioppo, M; Sesia, I; Shang, H; Signorile, G; Stahl, K; Steinel, M; Sterr, U; Suavez Ramirezi, J; Tofful, A; Tonnes, M; Tran, A; Tunesi, J; Wallin, A E; Waterholter, T; Zarei, M; Zyskind, C (2024) Robust Optical Clocks for International Timescales (ROCIT). Journal of Physics: Conference Series, 2889. 012022

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Abstract

The recently concluded collaborative European project “Robust optical clocks for international timescales” (ROCIT) tackled some of the key challenges on the roadmap towards a redefinition of the SI second. This paper gives an overview of progress made on improving the robustness and automation of optical clocks and verifying their uncertainty budgets through coordinated international comparison campaigns. It also presents work on the incorporation of optical clocks into time scales, covering both their use to steer local physical time scales and their use for evaluations of hydrogen masers contributing data for the computation of International Atomic Time (TAI). The overall objective of the project was to bring European optical clocks to the stage where they could be operated routinely as secondary frequency standards, regularly contributing to TAI.

Item Type:	Article
Keywords:	optical clocks, clock comparisons, redefinition of the second, time scales
Subjects:	Time and Frequency > Optical Frequency Standards and Metrology
Divisions:	Time & Frequency
Identification number/DOI:	10.1088/1742-6596/2889/1/012022
Last Modified:	03 Mar 2025 16:08
URI:	https://eprintspublications.npl.co.uk/id/eprint/10124