In the Meeting Report 'An extra-ordinary ruler' (Nature Photon. 3, 435–436; 2009 ), the CLEO/IQEC conference dates were incorrect and should have been 31 May – 5 June.
Corrected in the HTML and PDF versions, after print: 11 August 2009.
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The online version of the original article can be found at 10.1038/nphoton.2009.126
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Correction. Nature Photon 3, 501 (2009). https://doi.org/10.1038/nphoton.2009.161
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DOI: https://doi.org/10.1038/nphoton.2009.161
