Control of the wavelength and temporal profile of quantum states of light is an important resource in the development of photonic quantum information technology, where it can be used to interface disparate physical systems, overcome fabrication-induced inhomogeneity, and allow for more optimal detection. This talk will describe proof-of-principle experiments which demonstrate telecom-to-visible conversion, production of identical photons from initially spectrally distinct sources, and modification of the temporal shape of the photon wavepackets using a quantum dot single photon source in conjunction with three-wave-mixing in a nonlinear crystal. It will also discuss recent efforts to develop quantum frequency converters in a scalable, chip-based platform, using both material and engineered nonlinearities based on radiation pressure coupling between photons and phonons.