We experimentally demonstrate a high-fidelity visible-to-telecommunicationwavelength conversion of a photon by using a solid-state-based differencefrequency generation. In the experiment, one half of a pico-second visibleentangled photon pair at 780 nm is converted to a 1522-nm photon, resulting inthe entangled photon pair between 780 nm and 1522 nm. Using superconductingsingle-photon detectors with low dark count rates and small timing jitters, weselectively observed well-defined temporal modes containing the two photons. Weachieved a fidelity of $0.93 \pm 0.04$ after the wavelength conversion,indicating that our solid-state-based scheme can be used for faithful frequencydown-conversion of visible photons emitted from quantum memories composed ofvarious media.
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