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THU: Thursday Contributed Sessions

THU 13: Poster Session: Applications

THU 13.40: Poster

Donnerstag, 11. September 2025, 16:30–18:30, ZHG Foyer 1. OG

Towards fiber-integrated quantum frequency conversion for quantum networks — •Felix Rohe, Marlon Schäfer, Tobias Bauer, David Lindler, and Christoph Becher — Universität des Saarlandes, Fachrichtung Physik, Campus E2 6, 66123 Saarbrücken

Quantum frequency conversion to the low-loss telecom bands is a key enabling technology for long-range fiber-based quantum networks. While many state-of-the-art conversion setups use free-space coupling to nonlinear waveguides, for applications outside of a controlled lab environment, devices would greatly benefit from the substitution of free-space optics in favor of fiber-based components.
Here, we present the coupling of a solid-core photonic crystal fiber (PCF) to a periodically-poled lithium niobate (PPLN) waveguide. PCF are promising candidates for a fiber-integrated design because of their ability to simultaneously guide waves with a large difference in wavelength in the fundamental mode.
To evaluate the performance of this approach we down-convert photons at 619  nm to 885  nm by mixing with a strong pump field at 2062  nm in a difference frequency generation process. This provides the first stage of a two-stage, low-noise conversion scheme for photons emitted from the tin-vacancy center in diamond [1]. We show the efficiencies for simultaneous coupling of both input fields to the PPLN waveguide, as well as first results on the conversion efficiency and conversion-induced noise rates.
[1] Lindler, D. et al., Optica Quantum 2.0, paper QW4A.1

Keywords: quantum frequency conversion; photonic crystal fiber; nonlinear optics; quantum networks