Correction to: Nature Physics https://doi.org/10.1038/s41567-019-0536-2, published online 27 May 2019.

In the Supplementary Information initially published online for this Letter, the x axis labels were missing in Supplementary Fig. 5a–c; they should have been ‘t (μs)’, ‘ν (MHz)’ and ‘t (μs)’, respectively. These labels have now been added.