title: Detection of the ultranarrow temporal correlation of twin beams via sum-frequency generation.
abstract: 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.
authors.affiliation: CNISM and Dipartimento di Alta Tecnologia, Università dell'Insubria, Via Valleggio 11, Como, Italy.
authors.forename: O
authors.initials: O
authors.lastname: Jedrkiewicz
authors.forename: J-L
authors.initials: JL
authors.lastname: Blanchet
authors.forename: E
authors.initials: E
authors.lastname: Brambilla
authors.forename: P
authors.initials: P
authors.lastname: Di Trapani
authors.forename: A
authors.initials: A
authors.lastname: Gatti