Community Research and Development Information Service - CORDIS


AdOC Report Summary

Project ID: 617553
Funded under: FP7-IDEAS-ERC
Country: France

Periodic Report Summary 3 - ADOC (Advance Optical Clocks)

The project focuses on clocks with extreme precision and their applications. These includes: - testing fundamental laws of nature and searching for physics beyond the standard model of particle physics, in relation with the quest for unified theory of gravitation and quantum mechanics, - searching for dark matter, - using clocks as novel sensors of the earth gravity, - redefining and realizing time based on optical transitions and optical clocks, - studying laser cooled mercury physics, especially when relevant to clocks.
We are developing an optical lattice clock based on mercury (Hg) which is chosen for its favorable properties with respect to the above goals. We improved the precision of our Hg clock by a factor of 30 so far. This relies upon studying many physical effects impacting the clock. In doing so, we have and will demonstrate technologies and methods applicable to other clocks and beyond. We compared pour Hg clock to other clocks, yielding new precise atomic frequency ratios, which are and will the basic input for the above goals. These measurements contributed international reference values and to the process toward a redefinition of the time. We prepared for a new series of comparisons, this time involving European scale optical clock comparison by fiber link, with which our Hg clock will contribute testing laws of physics.
We have modelled how clocks can contribute to measuring and modelling earth gravity. We have shown the benefit of clock in a first set of well-chosen prototypical terrains. To do so, we developed generic numerical simulation tools which can and will be applied to other types of region of interest. The long term goal is to develop chronometric geodesy for earth science.

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