A very interesting report on the latest effort to measure the speed of light of single photons[1]. Even in an anomalous dispersive material where the group velocity can be "superluminal" such as in the infamous NEC experiment, no part of the wave actually moves faster than c. This experiment confirms it.
Zz.
[1] S. Zhang et al., Phys. Rev. Lett. v.106, p.243602 (2011).
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