Error threshold in active steering protocols for few-qubit systems
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866916576655048704 |
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| author | Ackermann, Nico Morales, Samuel Yeyati, Alfredo Levy Diehl, Sebastian Egger, Reinhold |
| author_facet | Ackermann, Nico Morales, Samuel Yeyati, Alfredo Levy Diehl, Sebastian Egger, Reinhold |
| contents | We study active steering protocols for weakly measured qubits in the presence of error channels due to amplitude and phase noise. If the error rate is sufficiently small, the protocol approaches and stabilizes a predesignated pure target state with high fidelity and high purity, and thus implements autonomous state stabilization. We present numerical simulation results for one and two qubits, taking Andreev qubit circuits as example. As function of the error rate, a sharp threshold separates an error-correcting weak-damping regime from a strong-damping regime where the target state cannot be reached anymore. At the threshold, the purity gap closes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_10960 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Error threshold in active steering protocols for few-qubit systems Ackermann, Nico Morales, Samuel Yeyati, Alfredo Levy Diehl, Sebastian Egger, Reinhold Quantum Physics Mesoscale and Nanoscale Physics We study active steering protocols for weakly measured qubits in the presence of error channels due to amplitude and phase noise. If the error rate is sufficiently small, the protocol approaches and stabilizes a predesignated pure target state with high fidelity and high purity, and thus implements autonomous state stabilization. We present numerical simulation results for one and two qubits, taking Andreev qubit circuits as example. As function of the error rate, a sharp threshold separates an error-correcting weak-damping regime from a strong-damping regime where the target state cannot be reached anymore. At the threshold, the purity gap closes. |
| title | Error threshold in active steering protocols for few-qubit systems |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2408.10960 |