Quantum Optics Seminar: Mathias Korsgaard

Quantum Frequency Conversion using Four-Wave Mixing

Quantum frequency conversion (QFC) is crucial in advancing quantum communication and computing. The coherent frequency conversion of quantum optical states acts as an interconnection between quantum optical systems operating at different wavelengths while maintaining their inherent quantum properties. Four-wave mixing Bragg scattering (BS) has been proposed as an ideal candidate for QFC due to its ability to imitate the similar three-wave mixing process; although, with the advantage of being a quadratic nonlinear interaction which is highly tunable and is not constrained by material properties. However, challenges arise in fiber-optical implementations due to noise photons induced by Raman scattering. This thesis theoretically studies the impact of Raman scattering on BS-induced QFC, presenting a full-vectorial model encompassing instantaneous and noninstantaneous four-wave mixing interactions. The study uncovers insights into quantum dynamics and the effects of Raman scattering through analytical and numerical analyses, laying the groundwork for addressing its impact in practical implementations. The investigation contributes to a comprehensive understanding of Raman scattering effects on BS-induced QFC, paving the way for improved quantum communication and computing applications.