Correlated Error Bursts in a Gap-Engineered Superconducting Qubit Array
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arXiv
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2025
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| author | Kurilovich, Vladislav D. Roberts, Gabrielle Martin, Leigh S. McEwen, Matt Eickbusch, Alec Faoro, Lara Ioffe, Lev B. Atalaya, Juan Bilmes, Alexander Kreikebaum, John Mark Bengtsson, Andreas Klimov, Paul Neeley, Matthew Mruczkiewicz, Wojciech Miao, Kevin Aleiner, Igor L. Kelly, Julian Chen, Yu Satzinger, Kevin Opremcak, Alex |
| author_facet | Kurilovich, Vladislav D. Roberts, Gabrielle Martin, Leigh S. McEwen, Matt Eickbusch, Alec Faoro, Lara Ioffe, Lev B. Atalaya, Juan Bilmes, Alexander Kreikebaum, John Mark Bengtsson, Andreas Klimov, Paul Neeley, Matthew Mruczkiewicz, Wojciech Miao, Kevin Aleiner, Igor L. Kelly, Julian Chen, Yu Satzinger, Kevin Opremcak, Alex |
| contents | One of the roadblocks towards the implementation of a fault-tolerant superconducting quantum processor is impacts of ionizing radiation with the qubit substrate. Such impacts temporarily elevate the density of quasiparticles (QPs) across the device, leading to correlated qubit error bursts. The most damaging errors, $T_1$ errors, stem from QP tunneling across the qubit Josephson junctions (JJs). Recently, we demonstrated that this type of error can be strongly suppressed by engineering the profile of superconducting gap at the JJs in a way that prevents QP tunneling. In this work, we identify a new type of impact-induced correlated error that persists in the presence of gap engineering. We observe that impacts shift the frequencies of the affected qubits, and thus lead to correlated phase errors. The frequency shifts are systematically negative, reach values up to $3\,{\rm MHz}$, and last for $\sim 1\,{\rm ms}$. We provide evidence that the shifts originate from QP-qubit interactions in the JJ region. Further, we demonstrate that the shift-induced phase errors can be detrimental to the performance of quantum error correction protocols. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_18228 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Correlated Error Bursts in a Gap-Engineered Superconducting Qubit Array Kurilovich, Vladislav D. Roberts, Gabrielle Martin, Leigh S. McEwen, Matt Eickbusch, Alec Faoro, Lara Ioffe, Lev B. Atalaya, Juan Bilmes, Alexander Kreikebaum, John Mark Bengtsson, Andreas Klimov, Paul Neeley, Matthew Mruczkiewicz, Wojciech Miao, Kevin Aleiner, Igor L. Kelly, Julian Chen, Yu Satzinger, Kevin Opremcak, Alex Quantum Physics Mesoscale and Nanoscale Physics One of the roadblocks towards the implementation of a fault-tolerant superconducting quantum processor is impacts of ionizing radiation with the qubit substrate. Such impacts temporarily elevate the density of quasiparticles (QPs) across the device, leading to correlated qubit error bursts. The most damaging errors, $T_1$ errors, stem from QP tunneling across the qubit Josephson junctions (JJs). Recently, we demonstrated that this type of error can be strongly suppressed by engineering the profile of superconducting gap at the JJs in a way that prevents QP tunneling. In this work, we identify a new type of impact-induced correlated error that persists in the presence of gap engineering. We observe that impacts shift the frequencies of the affected qubits, and thus lead to correlated phase errors. The frequency shifts are systematically negative, reach values up to $3\,{\rm MHz}$, and last for $\sim 1\,{\rm ms}$. We provide evidence that the shifts originate from QP-qubit interactions in the JJ region. Further, we demonstrate that the shift-induced phase errors can be detrimental to the performance of quantum error correction protocols. |
| title | Correlated Error Bursts in a Gap-Engineered Superconducting Qubit Array |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2506.18228 |