Sub-shot-noise phase quadrature measurement of intense light beams.
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.
Glöckl
O
O
Institut für Optik, Information und Photonik, Max-Planck Forschungsgruppe, Universität Erlangen-Nürnberg, Staudtstrasse 7/B2, 91058 Erlangen, Germany. gloeckl@kerr.physik.uni-erlangen.de
Andersen
U L
UL
Lorenz
S
S
Silberhorn
Ch
Ch
Korolkova
N
N
Leuchs
G
G