Correction to: Nature Electronics https://doi.org/10.1038/s41928-018-0072-6, published online 14 May 2018.

In the version of this Article originally published, a division symbol was mistakenly omitted from both of the y axis labels in Fig. 5a. The label in the left panel should have read ‘Re((ω×ω0)/2π) (MHz)’ and the label in the right panel should have read ‘Im((ω×ω0)/2π) (MHz)’. This has now been corrected.