A two-dimensional 10-qubit array in germanium with robust and localised qubit control
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866917155346317312 |
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| author | John, Valentin Yu, Cécile X. van Straaten, Barnaby Rodríguez-Mena, Esteban A. Rodríguez, Mauricio Oosterhout, Stefan Stehouwer, Lucas E. A. Scappucci, Giordano Bosco, Stefano Rimbach-Russ, Maximilian Niquet, Yann-Michel Borsoi, Francesco Veldhorst, Menno |
| author_facet | John, Valentin Yu, Cécile X. van Straaten, Barnaby Rodríguez-Mena, Esteban A. Rodríguez, Mauricio Oosterhout, Stefan Stehouwer, Lucas E. A. Scappucci, Giordano Bosco, Stefano Rimbach-Russ, Maximilian Niquet, Yann-Michel Borsoi, Francesco Veldhorst, Menno |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_16044 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A two-dimensional 10-qubit array in germanium with robust and localised qubit control John, Valentin Yu, Cécile X. van Straaten, Barnaby Rodríguez-Mena, Esteban A. Rodríguez, Mauricio Oosterhout, Stefan Stehouwer, Lucas E. A. Scappucci, Giordano Bosco, Stefano Rimbach-Russ, Maximilian Niquet, Yann-Michel Borsoi, Francesco Veldhorst, Menno Mesoscale and Nanoscale Physics Quantum Physics 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. |
| title | A two-dimensional 10-qubit array in germanium with robust and localised qubit control |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2412.16044 |