Using a spin-triplet encoding to enhance shuttling fidelities in Si/SiGe quantum wells
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866909038370881536 |
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| author | Losert, Merritt P. R. Coppersmith, S. N. Friesen, Mark |
| author_facet | Losert, Merritt P. R. Coppersmith, S. N. Friesen, Mark |
| contents | Spatial variations of the valley splitting in a quantum well present a key challenge for conveyor-mode shuttling of electron spins in Si/SiGe, giving rise to Landau-Zener-like excitations that cause leakage outside the qubit subspace. Here, we propose an unconventional two-electron qubit encoding, based on valley-singlet states, that is largely immune to Landau-Zener leakage processes. In contrast to single-electron spins, the shuttling fidelity actually improves for small valley splittings, in this case. We show that high fidelities can be achieved without applying any special procedures, such as fine-tuning of the shuttling path. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_12687 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Using a spin-triplet encoding to enhance shuttling fidelities in Si/SiGe quantum wells Losert, Merritt P. R. Coppersmith, S. N. Friesen, Mark Mesoscale and Nanoscale Physics Spatial variations of the valley splitting in a quantum well present a key challenge for conveyor-mode shuttling of electron spins in Si/SiGe, giving rise to Landau-Zener-like excitations that cause leakage outside the qubit subspace. Here, we propose an unconventional two-electron qubit encoding, based on valley-singlet states, that is largely immune to Landau-Zener leakage processes. In contrast to single-electron spins, the shuttling fidelity actually improves for small valley splittings, in this case. We show that high fidelities can be achieved without applying any special procedures, such as fine-tuning of the shuttling path. |
| title | Using a spin-triplet encoding to enhance shuttling fidelities in Si/SiGe quantum wells |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2605.12687 |