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The growing requirement for photon pairs with specific spectral correlationsin quantum optics experiments has created a demand for fast, high resolutionand accurate source characterization. A promising tool for suchcharacterization uses the classical stimulated process, in which an additionalseed laser stimulates photon generation yielding much higher count rates, asrecently demonstrated for a $\chi^{(2)}$ integrated source in A.~Eckstein\emph{et al.}, Laser Photon. Rev. \textbf{8}, L76 (2014). In this work weextend these results to $\chi^{(3)}$ sources, demonstrating spectralcorrelation measurements via stimulated four-wave mixing for the first time ina integrated optical waveguide, namely a silicon nanowire. We directly confirmthe speed-up due to higher count rates and demonstrate that additionalresolution can be gained when compared to traditional coincidence measurements.As pump pulse duration can influence the degree of spectral entanglement, allof our measurements are taken for two different pump pulse widths. This allowsus to confirm that the classical stimulated process correctly captures thedegree of spectral entanglement regardless of pump pulse duration, and cementsits place as an essential characterization method for the development of futurequantum integrated devices.

Bi-photon spectral correlation measurements from a silicon nanowire in the quantum and classical regimes