Generation of Squeezed States by Parametric Down Conversion by Ling-An Wu and others (1986, Physical Review Letters 57, 2520–2523)

Ling-An Wu, H. J. Kimble, John L. Hall and Huifa Wu reported cavity degenerate parametric down conversion and below-vacuum optical quadrature noise measured by balanced homodyne detection. The publisher abstract also emphasizes attenuation when comparing measured and inferred squeezing. doi.org/10.1103/PhysRevLett.57.2520