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HL: Fachverband Halbleiterphysik
HL 26: Poster II
HL 26.35: Poster
Mittwoch, 11. März 2026, 09:30–11:30, P1
Fabrication of SNSPDs on TF-LNoI for measurement device independent QKD — •Simon Palitza1,2,3, Bilal Malik1,2,3, and Carsten Schuck1,2,3 — 1Department for Quantum Technology, University of Münster — 2Center for NanoTechnology - CeNTech, Münster — 3Center for Soft Nanoscience - SoN, Münster
Thin-Film Lithium Niobate on Insulator (TF-LNoI) has been recognized as a promising platform for realizing low-loss propagation and high-speed modulation of optical signals in photonic integrated circuits. However, quantum technology applications, such as quantum key distribution (QKD) also require integrating single photon detection capabilities with nanophotonic functionalities. Here we show how crucial optical circuit components of a QKD-receiver can be co-integrated with Nb-based Superconducting Nanowire Single Photon Detectors (SNSPDs) on the TF-LNoI-platform. We specifically assess the influence of ubiquitous lithium diffusion on SNSPD performance and explore mitigation strategies in the design and nanofabrication process flow, such as introducing diffusion barrier layers. Combining efficient measurement capabilities with the stability and low loss routing of optical signals in monolithic LNoI-circuits provides a viable way towards realizing quantum communication protocols, such as measurement device independent QKD.
Keywords: lithium niobate; on-chip detection; quantum key distribution; photonics; quantum technology