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HL: Fachverband Halbleiterphysik

HL 29: Poster II

HL 29.54: Poster

Dienstag, 18. März 2025, 18:00–20:00, P1

Progress on fully gate-defined optical interfaces to spin qubits — •Maxim Reznikov¹, Sebastian Kindel¹, Kui Wu², Nikolai Spitzer³, Andreas D. Wieck³, Arne Ludwig³, Jeremy Witzens², and Hendrik Bluhm¹ — ¹JARA-FIT Institute for Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, Germany — ²Institute of Integrated Photonics, RWTH Aachen University, Germany — ³Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Germany

Advancing quantum networks beyond proof-of-concept applications requires an approach for fabricating quantum repeater nodes with multiple qubits and optical interfaces in a controlled manner. Semiconductor spin qubits in gate-defined quantum dots address these needs in terms of established high-fidelity qubit operations and compatibility with industrial semiconductor technology. By employing electrostatic gating on either side of a submicron-thick heterostructure, excitons can be precisely localized at deterministic positions, thus also realizing an optical interface. These exciton trapping devices overcome the fabrication randomness associated with self-assembled quantum dots and enabling fine-tuning of operational wavelengths.

In this work, we demonstrate the successful integration of exciton trapping devices based on GaAs quantum wells into photonic crystal cavities. Additionally, we show the same confinement mechanism can be transferred to the Ge/SiGe platform, which is more compatible with industrial processing and telecom wavelength.

Keywords: quantum dots; spin qubit; quantum repeater; quantum networks