title: Sub-shot-noise phase quadrature measurement of intense light beams.
abstract: We present a setup for performing sub-shot-noise measurements of the phase quadrature of intense pulsed light without the use of a separate local oscillator. A Mach-Zehnder interferometer with an unbalanced arm length is used to detect the fluctuations of the phase quadrature at a single sideband frequency. With this setup, the nonseparability of a pair of quadrature-entangled beams is demonstrated experimentally.
authors.affiliation: Institut für Optik, Information und Photonik, Max-Planck Forschungsgruppe, Universität Erlangen-Nürnberg, Staudtstrasse 7/B2, 91058 Erlangen, Germany. gloeckl@kerr.physik.uni-erlangen.de
authors.forename: O
authors.initials: O
authors.lastname: Glöckl
authors.forename: U L
authors.initials: UL
authors.lastname: Andersen
authors.forename: S
authors.initials: S
authors.lastname: Lorenz
authors.forename: Ch
authors.initials: Ch
authors.lastname: Silberhorn
authors.forename: N
authors.initials: N
authors.lastname: Korolkova
authors.forename: G
authors.initials: G
authors.lastname: Leuchs