Quantum Frequency Translation of Single-Photon States in Photonic Crystal Fiber

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We experimentally demonstrate frequency translation of a nonclassical optical field via the Bragg scattering four-wave mixing process in a photonic crystal fiber (PCF). The high nonlinearity and the ability to control dispersion in PCF enable efficient translation between photon channels within the visible to-near-infrared spectral range, useful in quantum networks. Heralded single photons at 683 nm were translated to 659 nm with an efficiency of 28.6 ± 2.2 percent. Second-order correlation measurements on the 683-nm and 659-nm fields yielded g⁽²⁾₆₈₃(0) = 0.21 ± 0.02 and g⁽²⁾₆₅₉(0) = 0.19 ± 0.05 respectively, showing the nonclassical nature of both fields.