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The spectral-temporal correlation and the correlation time of a biphotonwavepacket generated in the process of parametric down-conversion (PDC), is ofgreat importance for a broad range of quantum experiments. We utilise anintegrated PDC source to generate biphotons with different types ofspectral-temporal correlations and probe their respective correlation times.The outcomes confirms that the correlation time is independent of the coherencetime of the pump light, and it is only determined by the waveguide length andits dispersion properties. Furthermore, we investigate the properties of thePDC biphoton wavepacket exhibiting different types of spectral-temporalcorrelations and their suitability for quantum-enhanced applications.

Probing spectral-temporal correlations with a versatile integrated source of parametric down-conversion states