Robust and localised control of a 10-spin qubit array in germanium
Quantum computers require the systematic operation of qubits with high fidelity. For holes in germanium, the spin-orbit interaction allows for electric, fast and high-fidelity qubit gates. However, the strong g-tensor anisotropy of holes in germanium and their sensitivity to the operational and environmental conditions challenge the operation of large qubit arrays. Here, we investigate a two-dimensional 10-spin qubit array with single-qubit gate fidelities above 99%, and obtain surprisingly uniform qubit properties. By tuning the hole occupation, we demonstrate control over the spin susceptibility, enabling fast plunger gate driving with Rabi frequencies consistently above 1.45 MHz/ (mV ⋅ T). Moreover, we probe the locality of electric dipole spin resonance and find that the configuration with three-hole occupancy driven by the associated quantum dot plunger gate reduces crosstalk, lowering it by an average factor of 2.5 to nearest neighbours, compared to single-hole plunger driving. Theoretical modelling points towards the pronounced anisotropy of p-like orbitals as the main mechanism with significant contributions through Coulomb interactions, giving directions for reproducible control of large qubit arrays.
Authors
- Valentin John (ORCID: https://orcid.org/0000-0002-5157-8932)
- Stefan D. Oosterhout (ORCID: https://orcid.org/0000-0001-9648-5206)
- Francesco Borsoi (ORCID: https://orcid.org/0000-0001-9398-7614)
- Yann‐Michel Niquet (ORCID: https://orcid.org/0000-0002-1846-1396)
- Giordano Scappucci (ORCID: https://orcid.org/0000-0003-2512-0079)
- Lucas E. A. Stehouwer (ORCID: https://orcid.org/0009-0003-2891-4795)
- Mauricio J. Rodríguez (ORCID: https://orcid.org/0009-0004-0989-591X)
- Menno Veldhorst (ORCID: https://orcid.org/0000-0001-9730-3523)
- Stefano Bosco
- Maximilian Russ (ORCID: https://orcid.org/0000-0001-9775-0323)
- Esteban A. Rodríguez-Mena (ORCID: https://orcid.org/0000-0002-7059-8883)
- Barnaby van Straaten (ORCID: https://orcid.org/0009-0008-2113-8523)
- Cécile X. Yu (ORCID: https://orcid.org/0000-0002-9981-5685)
Institutions
- Netherlands Organisation for Applied Scientific Research (NL)
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
- CEA Grenoble (FR)
- QuTech (NL)
- Université Grenoble Alpes (FR)
- Delft University of Technology (NL)
Publication Details
- Journal
- Nature Communications
- Published
- 2025-11-26
- DOI
- https://doi.org/10.1038/s41467-025-65577-3
- Citations
- 5
- Primary Topic
- Quantum and electron transport phenomena
- Type
- article
- Field-Weighted Citation Impact
- 6.23
Funders
- European Commission
- Agence Nationale de la Recherche
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek
- HORIZON EUROPE Framework Programme
- Army Research Office