Fast All-Optical Switches in Si3N4 Photonic Integrated Circuits for Single-Photon Routing

Fabian Ruf*, Carlos F. D. Faurby, Stefano Paesani, Ying Wang, Lars Nielsen, Leonardo Midolo, Nicolas Volet, Martijn Heck

*Corresponding author for this work

Research output: Contribution to conferencePosterResearch


Quantum photonics is set to play an important role in future computation and communications technology. The transfer of promising lab-scale demonstrations toward scalable field-ready applications is enabled by photonic integrated circuits (PICs). In particular, mature foundry-based PIC platforms guarantee reliable and low-cost fabrication as well as high production capacity. Silicon-nitride based PICs can exhibit ultralow losses as low as 0.1 dB/m, demonstrating their suitability for integrated quantum photonics, even for nanosecond delay lines required for efficient routing of single photons.

The combination with deterministic quantum-dot based single-photon sources with high indistinguishability and purity offers the possibility for reliable generation of entangled photon states as fundamental resource for quantum computation and communications. To this end, low-loss optical switches matching the MHz to GHz single-photon generation rates are required but cannot be realized with standard components in Si3N4. To address this need, we have designed and optimized all-optical switches with GHz switching bandwidths based on the optical Kerr effect. The structures have been fabricated on a low-loss Si3N4 PIC foundry platform. Hong–Ou–Mandel measurements of on-chip Mach–Zehnder interferometers demonstrate the feasibility of the directional couplers as key components for applications in integrated quantum photonics.

Original languageEnglish
Publication dateNov 2022
Publication statusPublished - Nov 2022
EventNational Optics Congress - Aarhus, Denmark
Duration: 30 Nov 20221 Dec 2022


ConferenceNational Optics Congress


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