Readout sweet spots for spin qubits with strong spin-orbit interaction
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866918029841924096 |
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| author | Svastits, Domonkos Hetényi, Bence Széchenyi, Gábor Wootton, James Loss, Daniel Bosco, Stefano Pályi, András |
| author_facet | Svastits, Domonkos Hetényi, Bence Széchenyi, Gábor Wootton, James Loss, Daniel Bosco, Stefano Pályi, András |
| contents | Qubit readout schemes often deviate from ideal projective measurements, introducing critical issues that limit quantum computing performance. In this work, we model charge-sensing-based readout for semiconductor spin qubits in double quantum dots, and identify key error mechanisms caused by the back-action of the charge sensor. We quantify how the charge noise of the sensor, residual tunneling, and $g$-tensor modulation degrade readout fidelity, induce a mixed post-measurement state, and cause leakage from the computational subspace. For state-of-the-art systems with strong spin-orbit interaction and electrically tunable $g$-tensors, we identify a readout sweet spot, that is, a special device configuration where readout is closest to projective. Our framework provides a foundation for developing effective readout error mitigation strategies, with broad applications for optimizing readout performance for a variety of charge-sensing techniques, advancing quantum protocols, and improving adaptive circuits for error correction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_15878 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Readout sweet spots for spin qubits with strong spin-orbit interaction Svastits, Domonkos Hetényi, Bence Széchenyi, Gábor Wootton, James Loss, Daniel Bosco, Stefano Pályi, András Quantum Physics Mesoscale and Nanoscale Physics Qubit readout schemes often deviate from ideal projective measurements, introducing critical issues that limit quantum computing performance. In this work, we model charge-sensing-based readout for semiconductor spin qubits in double quantum dots, and identify key error mechanisms caused by the back-action of the charge sensor. We quantify how the charge noise of the sensor, residual tunneling, and $g$-tensor modulation degrade readout fidelity, induce a mixed post-measurement state, and cause leakage from the computational subspace. For state-of-the-art systems with strong spin-orbit interaction and electrically tunable $g$-tensors, we identify a readout sweet spot, that is, a special device configuration where readout is closest to projective. Our framework provides a foundation for developing effective readout error mitigation strategies, with broad applications for optimizing readout performance for a variety of charge-sensing techniques, advancing quantum protocols, and improving adaptive circuits for error correction. |
| title | Readout sweet spots for spin qubits with strong spin-orbit interaction |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2505.15878 |