Correction to: Nature Physics https://doi.org/10.1038/s41567-019-0447-2, published online 4 March 2019.
In the version of this Letter originally published, in equation (3) a superscript ‘2’ was mistakenly placed inside the square root sign; instead it should have been outside as shown below:
This error has now been corrected in the online versions.
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Lemieux, S., Giese, E., Fickler, R. et al. Publisher Correction: A primary radiation standard based on quantum nonlinear optics. Nat. Phys. 15, 869 (2019). https://doi.org/10.1038/s41567-019-0582-9
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DOI: https://doi.org/10.1038/s41567-019-0582-9