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Observation of quantum-correlated twin beams in cascaded nonlinear interactions

Salvatore Castrignano, Iolanda Ricciardi, Pasquale Maddaloni, Paolo De Natale, Stefan Wabnitz, and Maurizio De Rosa

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Abstract

We report on the generation of twin beams through a cascaded process of optical parametric oscillation in a doubly resonant second-harmonic generation system. These bright beams exhibit strong quantum correlations, enabling the observation of up to 5 dB of noise reduction in their intensity difference below the standard quantum limit.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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