Even-order dispersion cancellation, an effect previously identified with frequency-entangled photons, is demonstrated experimentally for the first time with a linear, classical interferometer. A combination of a broad bandwidth laser and a high resolution spectrometer was used to measure the intensity correlations between anti-correlated optical frequencies. Only 14% broadening of the correlation signal is observed when significant material dispersion, enough to broaden the regular interferogram by 4250%, is introduced into one arm of the interferometer.
@article{arxiv.0704.3938,
title = {Classical dispersion-cancellation interferometry},
author = {K. J. Resch and P. Puvanathasan and J. S. Lundeen and M. W. Mitchell and K. Bizheva},
journal= {arXiv preprint arXiv:0704.3938},
year = {2009}
}