In the legend to Fig. 4c in this Article, references 47 and 48 were incorrectly included in a list of sources for 87Sr clock frequency measurements. The correct sources are Hong et al.49 and Yamaguchi et al.50, as follows.
49. Hong, F.-L. et al. Measuring the frequency of a Sr optical lattice clock using a 120 km coherent optical transfer. Opt. Lett. 34, 692–694 (2009).
50. Yamaguchi, A. et al. Stability transfer between two clock lasers operating at different wavelengths for absolute frequency measurement of clock transition in 87Sr. Appl. Phys. Express 5, 022701 (2012).
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Le Targat, R., Lorini, L., Le Coq, Y. et al. Correction: Corrigendum: Experimental realization of an optical second with strontium lattice clocks. Nat Commun 4, 2782 (2013). https://doi.org/10.1038/ncomms3782
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DOI: https://doi.org/10.1038/ncomms3782
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