Photon frequency up-conversion with pump-induced second-harmonic noise suppression

A numerical simulation study is carried out to understand the optimal design of single photon frequency up-converter that achieves a large suppression of background noise without compromising photon frequency up-conversion efficiency. We show that by introducing a controlled amount of phase mismatch to the parasitic process of second-harmonic generation of the pump, background noise photons due to this process can be reduced effectively.