Nature Reviews Physics (2019) https://doi.org/10.1038/s42254-019-0089-4 Published online 29 July 2019
This article was originally published with an incorrect reference to the work of Oelker et al. in Nature Photonics. Reference 2 in the article and the ‘Refers to’ citation should read: Oelker E. et al. Demonstration of 4.8 × 10−17 stability at 1 s for two independent optical clocks. Nat. Photon. https://doi.org/10.1038/s41566-019-0493-4 (2019). This error has been corrected in the HTML and PDF versions of the article.
We apologize to readers for this error.
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Derevianko, A. Publisher Correction: Accurate and stable timekeeping. Nat Rev Phys 1, 577 (2019). https://doi.org/10.1038/s42254-019-0103-x
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DOI: https://doi.org/10.1038/s42254-019-0103-x
