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Springer eBooks

Correlation of Light Intensity

Published Jan 1, 2007• 0 citations
Publisher
DOI
10.1007/978-0-387-68327-0_8

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An experiment is proposed to show that after initial frequency and polarization selection, classical thermal light from two independent sources can be made path-polarization entangled. Such light will show new intensity-intensity correlations involving both path and polarization phases, formally similar to those for four-particle GHZ states. For fixed polarization phases, the correlations reduce to the Hanbury Brown-Twiss phase correlations. It is also shown that these classical correlations violate noncontextuality.
An experimental and theoretical study of the temporal correlations between the intensities of a broadband pump laser and Stokes light in stimulated Raman generation has been carried out. Direct measurements have been made of the pump laser and Stokes light intensity autocorrelation functions and of the intensity cross-correlation function between the two. Strong cross correlations are found. Nevertheless, the correlations are not perfect; that is, the Stokes intensity does not follow exactly the intensity variations of the laser. Transient effects and quantum fluctuations are shown, by theoretical modeling, to be responsible for the absence of perfect correlations.
We couple noise into the driving current of a laser diode to produce correlated light. We characterize the intensity correlations of the laser with two different techniques: two-detector photon coincidence and analysis of the photocurrent from a single detector. The light exhibits bunching with a magnitude and characteristic time set by the bandwidth and the amplitude of the noise modulating the laser driving current. A simple model based on amplitude modulation of the laser intensity agrees with the measured correlation functions. The bunched light can be used to probe systems that are sensitive to intensity correlations.