Nature, 406, 277–279 (2000).
It has been drawn to our attention that we inadvertently did not cite a previous paper by Segard and Macke1 on the topic of observed superluminal light pulse propagation in media with heavy absorption using a direct pulse shape detection technique. We did, however, cite an earlier paper by Chu and Wong2 on this topic using a different technique. Our introductory statement “in all previous experimental demonstrations, the light pulses experienced either very large absorption or severe reshaping” stands. We have now included this reference in a more detailed description3 of our experiment.
References
Segard, B. & Macke, B. Observation of negative velocity pulse propagation. Phys. Lett. A 109, 213–216 (1985).
Chu, S. & Wong, S. Linear pulse propagation in an absorbing medium. Phys. Rev. Lett. 48, 738–741 (1982).
Dogariu, A., Kuzmich, A. & Wang, L. J. Transparent anomalous dispersion and superluminal light pulse propagation at a negative group velocity. Phys. Rev. A 63, 053806 (2001).
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The online version of the original article can be found at 10.1038/35018520
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Wang, L., Kuzmich, A. & Dogariu, A. Correction: Gain-assisted superluminal light propagation. Nature 411, 974 (2001). https://doi.org/10.1038/35082117
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DOI: https://doi.org/10.1038/35082117
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