Electrically Tuneable Variability in Germanium Hole Spin Qubits
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| Format: | Preprint |
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2025
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| _version_ | 1866909962273292288 |
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| author | Valvo, Edmondo Jakob, Michele Del Vecchio, Patrick Rimbach-Russ, Maximilian Bosco, Stefano |
| author_facet | Valvo, Edmondo Jakob, Michele Del Vecchio, Patrick Rimbach-Russ, Maximilian Bosco, Stefano |
| contents | Hole spin qubits in planar germanium heterostructures are frontrunners for scalable semiconductor quantum computing. However, their current performance is mostly limited by large dot-to-dot variability that leads to uncontrolled qubit energies and random tilts in the spin quantization axis. Here, we propose a systematic and local method to engineer the spin qubit response by imprinting a controlled anisotropy in the quantum dot confinement, enabling on-demand electric g-tensor control. In particular, we find that both the quantum-dot size and asymmetry allow electrical tuning of the g-tensor and significantly suppress magnitude and angular variability of the spin response for selected magnetic field directions. We confirm this behavior by analyzing single-disorder realizations and statistical ensembles in state-of-the-art strained and unstrained germanium channels, showing that the latter provides an optimal path for $g$-tensor engineering. Our results provide practical design principles for on-demand control of the spin response and mitigating variability, paving the way towards large-scale germanium-based quantum computers. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_12702 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Electrically Tuneable Variability in Germanium Hole Spin Qubits Valvo, Edmondo Jakob, Michele Del Vecchio, Patrick Rimbach-Russ, Maximilian Bosco, Stefano Mesoscale and Nanoscale Physics Quantum Physics Hole spin qubits in planar germanium heterostructures are frontrunners for scalable semiconductor quantum computing. However, their current performance is mostly limited by large dot-to-dot variability that leads to uncontrolled qubit energies and random tilts in the spin quantization axis. Here, we propose a systematic and local method to engineer the spin qubit response by imprinting a controlled anisotropy in the quantum dot confinement, enabling on-demand electric g-tensor control. In particular, we find that both the quantum-dot size and asymmetry allow electrical tuning of the g-tensor and significantly suppress magnitude and angular variability of the spin response for selected magnetic field directions. We confirm this behavior by analyzing single-disorder realizations and statistical ensembles in state-of-the-art strained and unstrained germanium channels, showing that the latter provides an optimal path for $g$-tensor engineering. Our results provide practical design principles for on-demand control of the spin response and mitigating variability, paving the way towards large-scale germanium-based quantum computers. |
| title | Electrically Tuneable Variability in Germanium Hole Spin Qubits |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2512.12702 |