Correction to: Nature Photonics https://doi.org/10.1038/s41566-017-0001-7 (2017); published online 29 September 2017.

Owing to a technical error, the wrong version of the Supplementary Information was published for this Article; the equation \(E={x}_{{coupled}{donors}}\times {E}_{{FRET}}^{{local}}\) related to Supplementary Table 6 appeared incorrectly. This error has now been corrected.