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Exploiting strained epitaxial germanium for scaling low-noise spin qubits at the micrometre scale

Journal Article (2025)
Author(s)

Lucas E.A. Stehouwer (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Scappucci Lab, Kavli institute of nanoscience Delft)

Cécile X. Yu (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - BUS/Quantum Delft, TU Delft - QCD/Veldhorst Lab)

Barnaby van Straaten (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Veldhorst Lab, Kavli institute of nanoscience Delft)

Alberto Tosato (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Scappucci Lab)

Valentin John (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Veldhorst Lab, Kavli institute of nanoscience Delft)

Davide Degli Esposti (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QCD/Scappucci Lab, TU Delft - QCD/Vandersypen Lab)

Asser Elsayed (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Scappucci Lab)

Davide Costa (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Scappucci Lab, Kavli institute of nanoscience Delft)

Stefan D. Oosterhout (TU Delft - QN/Kavli Nanolab Delft, TNO, TU Delft - QuTech Advanced Research Centre, TU Delft - BUS/TNO STAFF)

Nico W. Hendrickx (Kavli institute of nanoscience Delft, TU Delft - QCD/Veldhorst Lab, TU Delft - QuTech Advanced Research Centre)

Menno Veldhorst (TU Delft - QN/Veldhorst Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Veldhorst Lab)

Francesco Borsoi (TU Delft - QCD/Veldhorst Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)

Giordano Scappucci (Kavli institute of nanoscience Delft, TU Delft - QCD/Scappucci Lab, TU Delft - Quantum Circuit Architectures and Technology, TU Delft - QuTech Advanced Research Centre)

DOI related publication
https://doi.org/10.1038/s41563-025-02276-w Final published version
More Info
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Publication Year
2025
Language
English
Journal title
Nature Materials
Issue number
12
Volume number
24
Pages (from-to)
1906-1912
Downloads counter
236
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Abstract

Disorder in the heterogeneous material stack of semiconductor spin qubit systems introduces noise that compromises quantum information processing, posing a challenge to coherently control large-scale quantum devices. Here we exploit low-disorder epitaxial, strained quantum wells in Ge/SiGe heterostructures grown on Ge wafers to comprehensively probe the noise properties of complex micrometre-scale devices, comprising quantum dots arranged in a two-dimensional array. We demonstrate an average low charge noise across different locations on the wafer, providing a benchmark for quantum confined holes. We then establish spin qubit control and extend our investigation from electrical to magnetic noise through spin echo measurements. Exploiting dynamical decoupling sequences, we quantify the power spectral density components arising from the hyperfine interaction with 73Ge spinful isotopes and identify coherence modulations associated with the interaction with the 29Si nuclear spin bath near the Ge quantum well, underscoring the need for full isotopic purification of the qubit host environment.