Correction to: Nature Reviews Physics https://doi.org/10.1038/s42254-020-00257-3 published online 12 November 2020.

In the original version of this manuscript, the acknowledgements section incorrectly stated that the work was funded by National Science Foundation Grant DMR 1207622. This grant number has been corrected to National Science Foundation Grant DMR 1607139 in the HTML and PDF versions of the manuscript.