In the News & Views 'The other sight' (Nature Physics 10, 622; 2014), we mistakenly described the experiment reported by Gabriela Barreto Lemos et al. (Nature 512, 409–412; 2014) as a four-photon experiment. It is, in fact, a two-photon experiment.
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The online version of the original article can be found at 10.1038/nphys3087
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Correction. Nature Phys 10, 714 (2014). https://doi.org/10.1038/nphys3131
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DOI: https://doi.org/10.1038/nphys3131
