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Q: Fachverband Quantenoptik und Photonik

Q 37: Poster III

Q 37.46: Poster

Wednesday, March 13, 2024, 17:00–19:00, Tent B

Coupling of photonic crystal fibers to nonlinear waveguides for quantum frequency conversion — •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 current devices use free space coupling to channel waveguides [1,2], for real world applications a more robust and compact design is desirable. Hence, direct butt-coupling of optical fibers to channel waveguides poses an interesting alternative.
Here, we investigate coupling of solid-core photonic crystal fibers (PCF) to periodically poled lithium niobate waveguides. PCF are promising candidates for use in quantum frequency conversion due to their ability to simultaneously guide waves with a large difference in wavelengths in the fundamental mode, which is crucial to spatially overlap the signal photons and the mixing wave. We show first results regarding coupling and conversion efficiencies.

[1] Bock, M. et al., Nat Commun 9, 1998 (2018)
[2] Schäfer, M. et al., Adv Quantum Technol. 2023, 2300228

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