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We generated -2.2 dB of broadband amplitude squeezing at 1064 nm in aperiodically poled KTiOPO_4 (PPKTP) waveguide, by coupling of the fundamentaland second harmonic continuous-wave fields. This is the largest amount ofsqueezing obtained to date in a KTP waveguide, limited by propagation losses.This result paves the way for further improvements by use of lower-loss buriedion-exchanged waveguides.

Broadband amplitude squeezing in a periodically poled KTiOPO_4 waveguide