The SI unit of time, the second, is currently defined in terms of the frequency of the microwave transition between the two ground state hyperfine levels of the 133Cs atom. However the most advanced optical atomic clocks have now reached levels of stability and accuracy that significantly surpass the performance of the best caesium primary standards. As a result, the possibility of a future redefinition of the second is being considered by the international metrology community.
Our project aims to tackle the key challenges that must be addressed before such a redefinition can be implemented. We will:
For more information, please contact the project coordinator, Dr Helen Margolis from NPL.
The research within this EURAMET joint research project receives funding from the European Community's Seventh Framework Programme, ERA-NET Plus, under Grant Agreement No. 217257.
The ITOC final workshop took place on Friday 8 April 2016 at the University of York, UK, in association with EFTF 2016
The 4 June 2015 edition of Nature includes a news story that discusses our experiment to compare optical clocks by broadband two-way satellite time and frequency transfer.
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