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

TL;DR

This paper demonstrates efficient frequency translation of nonclassical single-photon states in photonic crystal fiber using four-wave mixing, preserving quantum properties for potential quantum network applications.

Contribution

The first experimental demonstration of nonclassical single-photon frequency translation in photonic crystal fiber with high efficiency and preserved quantum correlations.

Findings

Heralded single photons at 683 nm translated to 659 nm with 28.6% efficiency.

Maintained nonclassical correlations after translation, with g^{(2)}(0) below 0.3.

Showed potential for integrating quantum frequency conversion in fiber-based quantum networks.

Abstract

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 $28.6 \pm 2.2$ percent. Second-order correlation measurements on the 683-nm and 659-nm fields yielded $g^{(2)}_{683}(0) = 0.21 \pm 0.02$ and $g^{(2)}_{659}(0) = 0.19 \pm 0.05$ respectively, showing the nonclassical nature of both fields.