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