title: Highly efficient single-pass source of pulsed single-mode twin beams of light.
abstract: We report the realization of a bright ultrafast type II parametric down-conversion source of twin beams free of any spatiotemporal correlations in a periodically poled KTiOPO4 (PP-KTP) waveguide. From a robust, single-pass setup it emits pulsed two-mode squeezed vacuum states: photon-number entangled pairs of single-mode pulses or, in terms of continuous variables quantum optics, pulsed Einstein-Podolsky-Rosen states in the telecom wavelength regime. We verify the single-mode character of our source by measuring Glauber correlation functions g(2) and demonstrate with a pump energy as low as 75 pJ per pump pulse a mean photon number of 2.5.
authors.affiliation: Max Planck Institute for the Science of Light, Günther-Scharowsky-Strasse 1, 91054 Erlangen, Germany. andreas.eckstein@mpl.mpg.de
authors.forename: Andreas
authors.initials: A
authors.lastname: Eckstein
authors.forename: Andreas
authors.initials: A
authors.lastname: Christ
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Mosley
authors.forename: Christine
authors.initials: C
authors.lastname: Silberhorn