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We develop a perturbative theory that describes a superluminal refractiveperturbation propagating in a dispersive medium and the subsequent excitationof the quantum vacuum zero-point fluctuations. We find a process similar to theanomalous Doppler effect: photons are emitted in correlated pairs and mainlywithin a Cerenkov-like cone, one on the forward and the other in backwarddirections. The number of photon pairs emitted from the perturbation increasesstrongly with the degree of superluminality and under realizable experimentalconditions, it can reach up to ~0.01 photons per pulse. Moreover, it is inprinciple possible to engineer the host medium so as to modify the effectivegroup refractive index. In the presence of "fast light" media, e.g. a withgroup index smaller than unity, a further ~10x enhancement may be achieved andthe photon emission spectrum is characterized by two sharp peaks that, infuture experiments would clearly identify the correlated emission of photonpairs.

Emission of correlated photon pairs from superluminal perturbations in dispersive media