Sub-shot-noise phase quadrature measurement of intense light beams
O. Glöckl, Ulrik L. Andersen, Stefan Lorenz +3 more
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.
arXiv:quant-ph/0406087•Optics Letters•Aug 13, 2004•36 citations