We experimentally demonstrate frequency translation of a nonclassical optical field via four-
wave mixing (Bragg-scattering process) in a photonic crystal fiber (PCF). The high
nonlinearity and the ability to control dispersion in PCF enable efficient translation between
nearby 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-and 659-nm fields …

Optics-based quantum information processing (QIP) has evolved in many systems, including
trapped atoms and ions, semiconductor quantum dots and nonlinear optics. A hybrid
quantum system has multiple platforms that are integrated to use each one's strengths while
minimizing its limitations. For example, one envisions long distance transmission by photons
in optical fibers at low-loss telecommunications wavelengths and data storage in quantum
memories at visible wavelengths. Quantum frequency translation (QFT) 1, 2—the ability to …