SAMOP 2023 – scientific programme

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QI: Fachverband Quanteninformation

QI 23: Poster II (joint session QI/Q)

QI 23.47: Poster

Wednesday, March 8, 2023, 16:30–19:00, Empore Lichthof

The Twente-Münster high-speed quantum key distribution link — •Niklas Humberg¹, Alejandro Sánchez-Postigo¹, Daan Stellinga², Pepijn Pinkse², and Carsten Schuck¹ — ¹Departement for Quantum Technology, Münster, Germany — ²University of Twente, Enschede, Netherlands

To build a pan-European network for quantum communication, many local nodes are needed to provide every city with access to quantum-secure encryption. One such link between local nodes is being developed between the University of Twente (UT) and the Westfälische Wilhelms-Universität Münster (WWU), to open a secure communication channel between the Netherlands and Germany. High-speed generation of quantum keys over the roughly 85km long dark fiber will be achieved by using wavelength division multiplexing into several frequency channels that operate in parallel. The qubit preparation and detection will be done using silicon nitride-on-insulator photonic integrated circuits. The receiver chip will integrate an interferometer with a 150 ps low-loss delay line in one arm for time bin encoding and an arrayed waveguide grating (AWG) for demultiplexing the wavelength channels. Each AWG output channel will be equipped with an efficient and low-noise superconducting nanowire single-photon detector, which have timing accuracies that are significantly better than the optical delay in the interferometer. We show progress on the chip design and the fabrication of detector devices.