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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2302.12330 |
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| _version_ | 1866917714174410752 |
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| author | Connolly, Thomas Kurilovich, Pavel D. Diamond, Spencer Nho, Heekun Bøttcher, Charlotte G. L. Glazman, Leonid I. Fatemi, Valla Devoret, Michel H. |
| author_facet | Connolly, Thomas Kurilovich, Pavel D. Diamond, Spencer Nho, Heekun Bøttcher, Charlotte G. L. Glazman, Leonid I. Fatemi, Valla Devoret, Michel H. |
| contents | The density of quasiparticles typically observed in superconducting qubits exceeds the value expected in equilibrium by many orders of magnitude. Can this out-of-equilibrium quasiparticle density still possess an energy distribution in equilibrium with the phonon bath? Here, we answer this question affirmatively by measuring the thermal activation of charge-parity switching in a transmon qubit with a difference in superconducting gap on the two sides of the Josephson junction. We then demonstrate how the gap asymmetry of the device can be exploited to manipulate its parity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2302_12330 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Coexistence of nonequilibrium density and equilibrium energy distribution of quasiparticles in a superconducting qubit Connolly, Thomas Kurilovich, Pavel D. Diamond, Spencer Nho, Heekun Bøttcher, Charlotte G. L. Glazman, Leonid I. Fatemi, Valla Devoret, Michel H. Quantum Physics Mesoscale and Nanoscale Physics The density of quasiparticles typically observed in superconducting qubits exceeds the value expected in equilibrium by many orders of magnitude. Can this out-of-equilibrium quasiparticle density still possess an energy distribution in equilibrium with the phonon bath? Here, we answer this question affirmatively by measuring the thermal activation of charge-parity switching in a transmon qubit with a difference in superconducting gap on the two sides of the Josephson junction. We then demonstrate how the gap asymmetry of the device can be exploited to manipulate its parity. |
| title | Coexistence of nonequilibrium density and equilibrium energy distribution of quasiparticles in a superconducting qubit |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2302.12330 |