NASA NTRS · 19870042722
Four-mode squeezing
Abstract
The four-wave-mixing interactions produced by pumping at two well-separated frequencies can couple four different radiation modes to generate a new kind of squeezed state of light. A dual-frequency homodyne detection scheme is described and is used to observe this type of nonclassical correlation. Initial experimental results in an optical fiber show a noise level 20 percent below the vacuum noise level for the output of the dual-frequency detector, even though the noise at each individual detector remains above the vacuum level.
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Schumaker, B. L., Perlmutter, S. H., Shelby, R. M., Levenson, M. D.. 1987-01-26. Four-mode squeezing. https://ntrs.nasa.gov/citations/19870042722
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