Group-velocity symmetry in photonic crystal fibre for ultra-tunable quantum frequency conversion

TL;DR

This paper demonstrates that by engineering a symmetric group velocity profile in a photonic crystal fibre, ultra-tunable, low-noise quantum frequency conversion can be achieved across a broad wavelength range, facilitating quantum network integration.

Contribution

It introduces a method to achieve broadband, low-noise quantum frequency conversion using a symmetric group velocity profile in photonic crystal fibres, with pump tuning to address fabrication discrepancies.

Findings

Achieved frequency conversion over an ultra-broad wavelength range.

Demonstrated mitigation of fabrication discrepancies through pump tuning.

Enabled a highly adaptable interface for quantum networks.

Abstract

Low-noise frequency conversion of single photons is a critical tool in establishing fibre-based quantum networks. We show that a single photonic crystal fibre can achieve frequency conversion by Bragg-scattering four-wave mixing of source photons from an ultra-broad wavelength range by engineering a symmetric group velocity profile. Furthermore, we discuss how pump tuning can mitigate realistic discrepancies in device fabrication. This enables a single highly adaptable frequency conversion interface to link disparate nodes in a quantum network via the telecoms band.