Correction to: Nature Physics https://doi.org/10.1038/s41567-020-0878-9, published online 20 April 2020.

In the version of this Article originally published online, two affiliations were incorrect. In affiliation 1, the city was given as ‘Beijing’, but should have been ‘Mianyang’; in affiliation 4, the institution was given as ‘Department of Physics’, but should have been ‘College of Computing Science’. All versions of the Article have been amended.