Two highly noise-correlated light beams are generated by nondegenerate parametric down-conversion. We report the production of sub-Poissonian light in one of the beams by using negative feedback (to the pump) from the other. This nonclassical light source has a postdetection Fano factor of 0.78 over a limited frequency range near 50 Hz with an intensity of about 60 pW.
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Tapster et al. (1988) studied this question.
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