Nature Physics 6, 845–849 (2010); published online: 19 September 2010; corrected after print: 2 November 2011.
The authors wish to point out that there were systematic errors in some of the demonstrations of Alice's optimal attempt to cheat (orange lines in Fig. 5, for n = 3, 4 and 6), due to misalignment of the waveplates. The data have been retaken with the corrected settings and are included in the following corrected figure (the plot for n = 2 is unchanged). The arguments of the paper are unaffected by this correction. These changes have been made in the PDF and HTML versions of this Letter.
The online version of the original article can be found at 10.1038/nphys1766
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