title: Temporal shaping of entangled photons.
abstract: We experimentally demonstrate shaping of the two-photon wave function of entangled-photon pairs, utilizing coherent pulse-shaping techniques. By performing spectral-phase manipulations we tailor the second-order correlation function of the photons exactly like a coherent ultrashort pulse. To observe the shaping we perform sum-frequency generation with an ultrahigh flux of entangled photons. At the appropriate conditions, sum-frequency generation performs as a coincidence detector with an ultrashort response time (approximately 100 fs), enabling a direct observation of the two-photon wave function. This property also enables us to demonstrate background-free, high-visibility two-photon interference oscillations.
authors.affiliation: Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel.
authors.forename: Avi
authors.initials: A
authors.lastname: Pe'er
authors.forename: Barak
authors.initials: B
authors.lastname: Dayan
authors.forename: Asher A
authors.initials: AA
authors.lastname: Friesem
authors.forename: Yaron
authors.initials: Y
authors.lastname: Silberberg