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Accurate and stable timekeeping

A Publisher Correction to this article was published on 09 August 2019

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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.


  1. Brewer, S. M. et al. 27Al+ quantum-logic clock with a systematic uncertainty below 10−18. Phys. Rev. Lett. 123, 033201 (2019).

  2. Oelker E. et al. Demonstration of 4.8 × 10−17 stability at 1 s for two independent optical clocks. Nat. Photon. (2019).

    Article  Google Scholar 

  3. Derevianko, A. & Katori, H. Colloquium: Physics of optical lattice clocks. Rev. Mod. Phys. 83, 331–348 (2011).

    Article  ADS  Google Scholar 

  4. Safronova, M. S. et al. Search for new physics with atoms and molecules. Rev. Mod. Phys. 90, 025008 (2018).

    Article  ADS  MathSciNet  Google Scholar 

  5. Ludlow, A. D. et al. Optical atomic clocks. Rev. Mod. Phys. 87, 637–701 (2015).

    Article  ADS  Google Scholar 

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Correspondence to Andrei Derevianko.

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Derevianko, A. Accurate and stable timekeeping. Nat Rev Phys 1, 478–479 (2019).

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