Reshaping, path uncertainty, and superluminal traveling

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Abstract
It is shown that when the wave packet of a photon passes through a region where more than one path mode can be chosen, the interference between these modes of the probability waves of the photon causes a reshaping process of the wave packet. In some conditions this reshaping gives rise to an apparent superluminal traveling, as observed by Steinberg, Kwiat, and Chiao [Phys. Rev. Lett. 71, 708 (1993)]. The present model also leads to some predictions that can be tested experimentally.