Abstract
We present a study of quantum spatial correlations in the transverse cross-section of the beam emitted by a degenerate optical parametric oscillator with spherical mirrors and finite-size pump. We show that these correlations are at the origin of efficient quantum noise reduction in proper combinations of field quadratures detected over symmetrical regions in the beam transverse section; moreover they offer the possibility of investigating EPR aspects for continuous variables. We discuss different regimes and show that EPR correlations arise over a broad range of values for the frequency spacing among adjacent transverse modes and for realistic values of the waist of the pump beam.
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