Group Leader

Rapid Communication in Phys. Rev. A

Two days ago, our paper entitled “Classical analog for dispersion cancellation of entangled photons with local detection” was published online as a Rapid Communication in Physical Review A. Dispersion cancellation can be observed in two scenarios. So-called Franson-type dispersion cancellation causes entangled photon pairs to remain tightly correlated in time when the photons are passed through equal magnitude, but opposite in sign, dispersion. This has often been attributed to be a purely quantum mechanical feature. The original paper by Franson considered non-local detection, in which the photons remain separate in space. In a recent experiment however, O’Donnell, the author, recombines the photons in a local detection scheme to demonstrate Franson-type dispersion cancellation. In our paper, we show that this demonstration and hence this dispersion cancellation effect can have a classical analogue. Re-enacting O’Donnell’s experiment, however using a pair of classical laser pulses instead of entangled photon pairs, we observe perfect dispersion cancellation under similar conditions. Perfect cancellation is observed for fs pulses with dispersion as large as 850 fs2, comparable to the quantum result, but with an 1013-fold improvement in signal brightness.

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