Project: Robust Optical Clocks for International Timescales

Acronym ROCIT (Reference Number: 18SIB05)
Duration 01/05/2019 - 30/04/2022
Project Topic Advances in telecoms and GPS technologies place increasing demands on the stability and accuracy of international reference timescales. Optical clocks offer better frequency stability and timing certainty than caesium primary frequency standards, and a redefinition of the second is anticipated based on potential for orders-of-magnitude improvements to accuracy. However, optical clocks aren’t yet accepted for international timescales as monitoring and user intervention is required. Systematic frequency shifts need to be accounted for, plus automated validation is necessary. The project targets unattended uptimes of 80 % to 90 % over weeks for two types of optical clocks. Optical fibre and satellite links will be used to compare frequencies, while traceability to the present definition of the SI second will be provided by absolute frequency measurements relative to caesium primary standards. The techniques and hardware developed should lead to smaller optical clocks, while significant science and innovation impacts are expected to arise from international consistency and long-term reliability through realisation and dissemination of a new SI unit of time.
Website visit project website
Network EMPIR
Call EMPIR Call 2018

Project partner

Number Name Role Country
1 NPL Management Limited Coordinator United Kingdom
2 Cesky Metrologicky Institut Partner Czech Republic
3 Central Office of Measures Partner Poland
4 Istituto Nazionale di Ricerca Metrologica Partner Italy
5 Laboratoire national de métrologie et d'essais Partner France
6 Observatoire de Paris Partner France
7 Physikalisch-Technische Bundesanstalt Partner Germany
8 Teknologian tutkimuskeskus VTT Oy Partner Finland
9 Ben-Gurion University of the Negev Partner Israel
10 Centre National de la Recherche Scientifique Partner France
11 Gottfried Wilhelm Leibniz Universität Hannover Partner Germany
12 Politecnico di Torino Partner Italy
13 Centrum Badan Kosmicznych Polskiej Akademii Nauk Partner Poland
14 Uniwersytet Mikolaja Kopernika w Toruniu Partner Poland