We review the measurement of entanglement in the above-threshold optical parametric oscillator, an experimental
challenge that lasted 17 years. The challenge was in part technical, owing to the difficulty of
measuring phase noise, but also related to unexpected noise features that remain unexplained. We describe
the experimental strategies used to measure phase noise and to circumvent the "extra" noise. The theoretical
prediction of a higher order of entanglement is presented, as well as measurements of bright three-color
quantum correlations.
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