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The recent detection of a large polarization degree in the optical emissionof an isolated neutron star led to the suggestion that this has been the firstevidence of vacuum polarization in a strong magnetic field, an effect predictedby quantum electrodynamics but never observed before. This claim was challangedin a paper by Capparelli, Maiani & Polosa (2017), according to whom a muchhigher polarization degree would be necessary to positively identify vacuumpolarization. Here we show that their conclusions are biased by severalinadequate assumptions and have no impact on the original claim.

A Comment on "A note on polarized light from Magnetars: QED effects and axion-like particles" by L.M. Capparelli, L. Maiani and A.D. Polosa