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We study theoretically and experimentally the quantum properties of a type IIfrequency degenerate optical parametric oscillator below threshold with aquarter-wave plate inserted inside the cavity which induces a linear couplingbetween the orthogonally polarized signal and idler fields. This originaldevice provides a good insight into general properties of two-mode gaussianstates, illustrated in terms of covariance matrix. We report on theexperimental generation of two-mode squeezed vacuum on non-orthogonalquadratures depending on the plate angle. After a simple operation, theentanglement is maximized and put into standard form, \textit{i.e.} quantumcorrelations and anti-correlations on orthogonal quadratures. A half-sum ofsqueezed variances as low as $0.33 \pm 0.02$, well below the unit limit forinseparability, is obtained and the entanglement measured by the entropy offormation

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

Effects of mode coupling on the generation of quadrature Einstein-Podolsky-Rosen entanglement in a type-II optical parametric oscillator below threshold