  The entanglement of quantum systems can produce a variety of nonclassical
effects that have practical applications in quantum information science. One
example of this is nonlocal dispersion cancellation, in which the effects of
dispersion on one photon can be canceled out by the dispersion experienced by a
second photon at a distant location. In this paper, we extend the analysis of
nonlocal dispersion cancellation to three or more photons. We find that
energy-time entanglement of three or more photons can lead to a complete or
partial cancellation of dispersion depending on the experimental conditions.
These results may be useful in implementing quantum key distribution in
networks with three or more nodes.
