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Roadmap for a redefinition of the second published


A working group of the Consultative Committee for Time and Frequency (CCTF), with the participation of PTB, has drawn up a plan for a future redefinition of the second based on the progress made with optical atomic clocks. The progress achieved and the improvements still required are being discussed in order to secure in the long term and to improve the quality of frequency measurements and time scales established today with cesium atomic clocks. A possible date for a redefinition is 2030. 

The complete scientific article is freely accessible at the journal Metrologia
link: Opens external link in new windowhttps://doi.org/10.1088/1681-7575/ad17d2