title: Observation of optical precursors at the biphoton level.
abstract: We describe the observation of a sharp leading-edge spike in a biphoton wave packet that is produced using slow light and measured by two-photon correlation. Using the stationary-phase approximation we characterize this spike as a Sommerfeld-Brillouin precursor resulting from the interference of low- and high-frequency spectral components.
authors.affiliation: Edward L. Ginzton Laboratory, Stanford University, Stanford, CA 94305, USA. dusw@ust.hk
authors.forename: Shengwang
authors.initials: S
authors.lastname: Du
authors.forename: Chinmay
authors.initials: C
authors.lastname: Belthangady
authors.forename: Pavel
authors.initials: P
authors.lastname: Kolchin
authors.forename: G Y
authors.initials: GY
authors.lastname: Yin
authors.forename: S E
authors.initials: SE
authors.lastname: Harris