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QI: Fachverband Quanteninformation

QI 37: Poster – Quantum Information Technologies (joint session Q/QI)

QI 37.7: Poster

Donnerstag, 13. März 2025, 17:00–19:00, Tent

Towards fiber-integrated quantum frequency conversion in PPLN waveguides — •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 devices use free-space coupling to nonlinear waveguides, for applications outside of a controlled lab environment, a more robust and compact design is desirable. One approach would be to substitute the free-space optics in favor of a fiber-based coupling scheme.

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. We show coupling efficiencies of 637 nm signal and 2162  nm pump fields, as well as conversion efficiency and pump-induced noise rate for the difference frequency generation 637 nm - 2162  nm = 903  nm.
As an outlook, we present a concept for an "all-fiber" two-stage quantum frequency converter for NV-resonant photons, that does not use free-space optics. A two-stage conversion scheme was shown to yield very low noise rates in the conversion of SiV-resonant photons [1].

[1] Schäfer, M. et al., Adv Quantum Technol. 2023, 2300228

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