Kavli Affiliate: Giordano Scappucci
| First 5 Authors: Valentin John, Cécile X. Yu, Barnaby van Straaten, Esteban A. Rodríguez-Mena, Mauricio Rodríguez
| Summary:
Quantum computers require the systematic operation of qubits with high
fidelity. For holes in germanium, the spin-orbit interaction allows for
textit{in situ} electric fast and high-fidelity qubit gates. However, the
interaction also causes a large qubit variability due to strong g-tensor
anisotropy and dependence on the environment. Here, we leverage advances in
material growth, device fabrication, and qubit control to realise a
two-dimensional 10-spin qubit array, with qubits coupled up to four neighbours
that can be controlled with high fidelity. By exploring the large parameter
space of gate voltages and quantum dot occupancies, we demonstrate that plunger
gate driving in the three-hole occupation enhances electric-dipole spin
resonance (EDSR), creating a highly localised qubit drive. Our findings,
confirmed with analytical and numerical models, highlight the crucial role of
intradot Coulomb interaction and magnetic field direction. Furthermore, the
ability to engineer qubits for robust control is a key asset for further
scaling.
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