Nature 446, 871–875 (2007)

The experimental values of correlation functions were measured at the difference angle = 20° (on the Poincaré sphere), rather than 18.8° as was stated in the original paper. The reported violation of 3.2 standard deviations refers to = 20°. In Supplementary Information II of the original paper the boundaries of all integrals over variables and should be the following: varies from -2 to 2; varies from ||/2 to 2 - ||/2. Also, in equation (35) and what follows, should be replaced by . The final inequality of the paper and all its conclusions do not change. The errors arose from our attempt for a more concise notation, but were never used in our actual calculations. We thank Stephen Parrott for pointing out these errors.

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