Below-threshold signal-idler quantum Kerr combs are the most explored quantum Kerr state to-date, both for fundamental study and application in quantum technologies. However, after the first onset of optical parametric oscillation, the connectivity of the below-threshold modes grows in complexity as modes which were once purely populated with spontaneous photons develop comparatively strong mean fields which drive correlations themselves. In this talk, I will describe numeric and experimental study of this second class of states, with a focus on quantum correlations and quadrature squeezing as tools for understanding classical nonlinear optics.
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