Atomic clocks reached a record-breaking uncertainty of less than 10−18 and the time needed to compare clocks is now less than an hour. These results push towards a possible redefinition of the second from a microwave to an optical standard.
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09 August 2019
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
References
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Derevianko, A. Accurate and stable timekeeping. Nat Rev Phys 1, 478–479 (2019). https://doi.org/10.1038/s42254-019-0089-4
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DOI: https://doi.org/10.1038/s42254-019-0089-4
