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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2505.08104 |
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| _version_ | 1866915774729289728 |
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| author | Nho, Heekun Connolly, Thomas Kurilovich, Pavel D. Diamond, Spencer Bøttcher, Charlotte G. L. Glazman, Leonid I. Devoret, Michel H. |
| author_facet | Nho, Heekun Connolly, Thomas Kurilovich, Pavel D. Diamond, Spencer Bøttcher, Charlotte G. L. Glazman, Leonid I. Devoret, Michel H. |
| contents | Ionizing radiation impacts create bursts of quasiparticle density in superconducting qubits. These bursts temporarily degrade qubit coherence which can be detrimental for quantum error correction. Here, we experimentally resolve quasiparticle bursts in 3D gap-engineered transmon qubits by continuously monitoring qubit transitions. Gap engineering allows us to reduce the burst detection rate by a factor of five. This reduction falls four orders of magnitude short of that expected if the quasiparticles were to quickly thermalize to the cryostat temperature. We associate the limited effect of gap engineering with the slow thermalization of the phonons in our chips after the burst. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_08104 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Recovery dynamics of a gap-engineered transmon after a quasiparticle burst Nho, Heekun Connolly, Thomas Kurilovich, Pavel D. Diamond, Spencer Bøttcher, Charlotte G. L. Glazman, Leonid I. Devoret, Michel H. Quantum Physics Mesoscale and Nanoscale Physics Ionizing radiation impacts create bursts of quasiparticle density in superconducting qubits. These bursts temporarily degrade qubit coherence which can be detrimental for quantum error correction. Here, we experimentally resolve quasiparticle bursts in 3D gap-engineered transmon qubits by continuously monitoring qubit transitions. Gap engineering allows us to reduce the burst detection rate by a factor of five. This reduction falls four orders of magnitude short of that expected if the quasiparticles were to quickly thermalize to the cryostat temperature. We associate the limited effect of gap engineering with the slow thermalization of the phonons in our chips after the burst. |
| title | Recovery dynamics of a gap-engineered transmon after a quasiparticle burst |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2505.08104 |