International Timescales with Optical Clocks (ITOC)

authored by
H. S. Margolis, R. M. Godun, P. Gill, L. A.M. Johnson, S. L. Shemar, P. B. Whibberley, D. Calonico, F. Levi, L. Lorini, M. Pizzocaro, P. Delva, S. Bize, J. Achkar, H. Denker, L. Timmen, C. Voigt, S. Falke, D. Piester, C. Lisdat, U. Sterr, S. Vogt, S. Weyers, J. Gersl, T. Lindvall, M. Merimaa

A new collaborative European project 'International timescales with optical clocks' (ITOC) aims to tackle the key challenges that must be addressed prior to a redefinition of the SI second. A coordinated programme of comparisons will be carried out between European optical clocks developed in five different laboratories, enabling their performance levels to be validated at an unprecedented level of accuracy. Supporting work will be carried out to evaluate relativistic effects that influence the comparisons, including the gravitational redshift of the clock transition frequencies. A proof-of-principle experiment will also be performed to demonstrate that optical clocks could be used to make direct measurements of the Earth's gravity potential with high temporal resolution.

Institute of Geodesy
External Organisation(s)
National Physical Laboratory (NPL)
Istituto Nazionale di Ricerca Metrologica (INRiM)
Observatoire de Paris (OBSPARIS)
National Metrology Institute of Germany (PTB)
Czech Metrology Institute
VTT Technical Research Centre of Finland Ltd.
Conference contribution
No. of pages
Publication date
Publication status
Peer reviewed
ASJC Scopus subject areas
Control and Systems Engineering
Electronic version(s) (Access: Unknown)

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