O. Jedrkiewicz, J. -L. Blanchet, E. Brambilla, P. Di Trapani, A. Gatti
We demonstrate the ultranarrow temporal correlation (6 fs full width half maximum) of twin beams generated by parametric down-conversion, by using the inverse process of sum-frequency generation. The result relies on an achromatic imaging of a huge bandwith of twin beams and on a careful control of their spatial degrees of freedom. The detrimental effects of spatial filtering and of imperfect imaging are shown toghether with the theoretical model used to describe the results.
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http://arxiv.org/abs/1203.3661
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