  Indistinguishable single photons are necessary for quantum information
processing applications. Resonant or quasiresonant excitation of single quantum
dots provides greater single photon indistinguishability than incoherent
pumping, but is also more challenging experimentally. Here, we demonstrate high
signal to noise quasiresonant excitation of InP/InGaP quantum dots. The
excitation is provided via second harmonic generated from a telecommunications
wavelength laser resonant with the fundamental mode of a photonic crystal
cavity, fabricated at twice the quantum dot transition wavelength. The second
harmonic is generated using the \chi(2) nonlinearity of the InGaP material
matrix.
