International timescales with optical clocks (ITOC)

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

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    21 Citations (Scopus)


    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.
    Original languageEnglish
    Title of host publication2013 Joint European Frequency and Time Forum & International Frequency Control Symposium (EFTF/IFC)
    PublisherIEEE Institute of Electrical and Electronic Engineers
    ISBN (Electronic)978-1-4799-0342-9 , 978-1-4799-0341-2
    Publication statusPublished - 2013
    MoE publication typeA4 Article in a conference publication
    EventJoint European Frequency and Time Forum and International Frequency Control Symposium, EFTF/IFC 2013 - Prague, Czech Republic
    Duration: 21 Jul 201325 Jul 2013


    ConferenceJoint European Frequency and Time Forum and International Frequency Control Symposium, EFTF/IFC 2013
    Abbreviated titleEFTF/IFC 2013
    Country/TerritoryCzech Republic


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