We present a setup to perform sub shot noise measurements of the phase quadrature for 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 side band frequency. Using this setup, the non--separability of a pair of quadrature entangled beams is demonstrated experimentally.
@article{arxiv.quant-ph/0406087,
title = {Sub shot noise phase quadrature measurement of intense light beams},
author = {O. Glöckl and U. L. Andersen and S. Lorenz and Ch. Silberhorn and N. Korolkova and G. Leuchs},
journal= {arXiv preprint arXiv:quant-ph/0406087},
year = {2009}
}
Comments
9 pages, 2 figures, accepted for publication in Optics Letters