  Hybrid quantum information devices that combine disparate physical systems
interacting through photons offer the promise of combining low-loss
telecommunications wavelength transmission with high fidelity visible
wavelength storage and manipulation. The realization of such systems requires
control over the waveform of single photons to achieve spectral and temporal
matching. Here, we experimentally demonstrate the simultaneous wavelength
translation and amplitude modulation of single photons generated by a quantum
dot emitting near 1300 nm with an exponentially-decaying waveform (lifetime
$\approx$1.5 ns). Quasi-phase-matched sum-frequency generation with a pulsed
1550 nm laser creates single photons at 710 nm with a controlled amplitude
modulation at 350 ps timescales.
