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We demonstrate background-free quantum frequency conversion of single photonsfrom an epitaxially-grown InAs quantum dot. Single photons at \approx 980 nmare combined with a pump laser near 1550 nm inside a periodically-poled lithiumniobate (PPLN) waveguide, generating single photons at \approx 600 nm. Thelarge red-detuning between the pump and signal wavelengths ensures nearlybackground-free conversion, avoiding processes such as upconversion ofanti-Stokes Raman scattered pump photons in the PPLN crystal. Second-ordercorrelation measurements on the single photon stream are performed both beforeand after conversion, confirming the preservation of photon statistics duringthe frequency conversion process.

Background-free quantum frequency conversion of single photons from a semiconductor quantum dot