News & Views | Published:


An optical clock to go

Nature Physicsvolume 14pages431432 (2018) | Download Citation

Bringing next-generation atomic clocks out of the lab is not an easy task, but doing so will unlock many new possibilities. As a crucial first step, a portable atomic clock has now been deployed for relativistic geodesy measurements in the Alps.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.


  1. 1.

    Grotti, J. et al. Nat. Phys. (2018).

  2. 2.

    Katori, H., Takamoto, M., Pal’chikov, V. G. & Ovsiannikov, V. D. Phys. Rev. Lett. 91, 173005 (2013).

  3. 3.

    Boyd, M. et al. Science 314, 1430–1433 (2006).

  4. 4.

    Schioppo, M. et al. Nat. Photon. 11, 48–52 (2017).

  5. 5.

    Nicholson, T. et al. Nat. Commun. 6, 6896 (2015).

  6. 6.

    Chou, C. W., Hume, D. B., Rosenband, T. & Wineland, D. Science 329, 1630–1633 (2010).

  7. 7.

    Takano, T. et al. Nat. Photon. 10, 662–666 (2016).

  8. 8.

    Koller, S. B. et al. Phys. Rev. Lett. 118, 073601 (2017).

  9. 9.

    Pizzocaro, M. et al. Metrologia 54, 102–112 (2017).

Download references

Author information


  1. Time and Frequency Division at the National Institute of Standards and Technology, Boulder, CO, USA

    • Andrew D. Ludlow


  1. Search for Andrew D. Ludlow in:

Corresponding author

Correspondence to Andrew D. Ludlow.

About this article

Publication history



Newsletter Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing