Robust and localised control of a 10-spin qubit array in germanium

Valentin John (), Cécile X. Yu, Barnaby van Straaten, Esteban A. Rodríguez-Mena, Mauricio Rodríguez, Stefan D. Oosterhout, Lucas E. A. Stehouwer, Giordano Scappucci, Maximilian Rimbach-Russ, Stefano Bosco, Francesco Borsoi, Yann-Michel Niquet and Menno Veldhorst ()
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Valentin John: Delft University of Technology, QuTech and Kavli Institute of Nanoscience
Cécile X. Yu: Delft University of Technology, QuTech and Kavli Institute of Nanoscience
Barnaby van Straaten: Delft University of Technology, QuTech and Kavli Institute of Nanoscience
Esteban A. Rodríguez-Mena: IRIG-MEM-L_Sim, Université Grenoble Alpes, CEA
Mauricio Rodríguez: IRIG-MEM-L_Sim, Université Grenoble Alpes, CEA
Stefan D. Oosterhout: QuTech and Netherlands Organisation for Applied Scientific Research
Lucas E. A. Stehouwer: Delft University of Technology, QuTech and Kavli Institute of Nanoscience
Giordano Scappucci: Delft University of Technology, QuTech and Kavli Institute of Nanoscience
Maximilian Rimbach-Russ: Delft University of Technology, QuTech and Kavli Institute of Nanoscience
Stefano Bosco: Delft University of Technology, QuTech and Kavli Institute of Nanoscience
Francesco Borsoi: Delft University of Technology, QuTech and Kavli Institute of Nanoscience
Yann-Michel Niquet: IRIG-MEM-L_Sim, Université Grenoble Alpes, CEA
Menno Veldhorst: Delft University of Technology, QuTech and Kavli Institute of Nanoscience

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: Abstract 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.

Date: 2025
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DOI: 10.1038/s41467-025-65577-3

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