Sub shot noise phase quadrature measurement of intense light beams
arXiv:quant-ph/0406087 · doi:10.1364/OL.29.001936
Abstract
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.
arXiv comment9 pages, 2 figures, accepted for publication in Optics Letters
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