Correction to: Nature Photonics https://doi.org/10.1038/nphoton.2016.122, published online 4 July 2016.

In this Article, the equation following the sentence “The extra damping introduced can be written as:” was incorrect and should have appeared as shown below:

$$\Gamma _{\rm{net}} = g\left( {\frac{{\kappa _{\rm{ex}}}}{{\kappa _{\rm{ex}}^2/4 + ({\it{\Delta }} + {\it{\Omega }}_{{\rm{LOP}}})^2}} - \frac{{\kappa _{\rm{ex}}}}{{\kappa _{\rm{ex}}^2/4 + ({\it{\Delta }} - {\it{\Omega }}_{\rm{LOP}})^2}}} \right)$$