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Tuning quantum correlations with intracavity photonic crystals

M. de Castro, Maria; Garcia-March, Miguel Angel; Gomila, Damia; Zambrini, Roberta.
Physical Review A 84, 033832 (1-6) (2011)

The effects of an intracavity photonic crystal in a multimode optical parametric oscillator are studied, with a special focus on quantum fluctuations. The capability to either stimulate or inhibit the spatial instability, lowering or increasing the parametric threshold, allows to control the intensity fluctuations and correlations. A significative quantum noise reduction and an increase of the range of squeezed quadratures are found above threshold where spatial Einstein-Podolsky-Rosen entanglement and inseparability are found.