Detection of the Ultranarrow Temporal Correlation of Twin Beams via Sum-Frequency Generation
Ottavia Jedrkiewicz, Jean-Luc Blanchet, E. Brambilla +2 more
We demonstrate the ultranarrow temporal correlation (6 fs full width half maximum) of twin beams generated by parametric down-conversion by using its reverse process, i.e., sum-frequency generation. The result relies on an achromatic imaging of a huge bandwidth of twin beams and on a careful control of their spatial degrees of freedom. The detrimental effects of spatial filtering and imperfect imaging are shown, along with the theoretical model used to describe the results.
arXiv:1203.3661•Physical Review Letters•Jun 22, 2012•27 citations