Correction to: Nature Photonics https://doi.org/10.1038/s41566-021-00927-3, published online 23 December 2021.

In the version of this article initially published, there was an error in Fig. 2. In the upper panel, left-hand y-axis “Group velocity dispersion” label, the units shown as “(fs2 mm–2)” should have read “(fs2 mm–1).” The error has been corrected in the HTML and PDF versions of the article.