Correction to: Nature Photonics https://doi.org/10.1038/s41566-022-01086-9. Published online 28 November 2022.

In the version of this article originally published, in the second paragraph of the main text, the centred dot in the expression now reading “(δA/λ2δΩ = 1…” was omitted. The error has been corrected in the HTML and PDF versions of the article.