Optical Parametric Oscillators (OPOs) consist of nonlinear (chi2) media inserted inside a cavity. When operated above the oscillation threshold, these devices generate intense, phase coherent optical beams. Triply resonant OPOs have been known for a long time to generate very large intensity quantum correlations. I will show that, when phase locking is introduced between the output beams, one can generate a record amount of entangled light with unique properties. I will also describe the principles of a novel device which can emit polarization entangled light.
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