Quantum theory of superluminal pulse propagation.
We consider the propagation in a dielectric medium of radiation emitted by a single-atom source. The source and dielectric atoms are assumed to be two-state systems, and the emitted light is incident on an ideal broadband detector. It is shown that the peak probability for producing a ;;click" at the detector can occur sooner than it could if there were no material medium between it and the source atom.
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Milonni
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Furuya
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R
Chiao