Salvatore Castrignano, Iolanda Ricciardi, Pasquale Maddaloni, Paolo De Natale, Stefan Wabnitz, and Maurizio De Rosa, Proc. of SPIE Photonics Europe 2024 Strasbourg, France – Vol. 13004
Abstract: We experimentally generate twin beams through cascaded quadratic processes in a nonlinear χ(2) crystal, leading to an internally pumped optical parametric oscillation, in a doubly resonant second-harmonic generation system. The exploration of the non-classical properties of these beams enabled the observation of up to 5 dB of noise reduction in their intensity difference below the standard quantum limit.
Results