Quasiparticle-induced decoherence of a driven superconducting qubit
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arXiv
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| Format: | Preprint |
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2025
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| author | Kishmar, Mykola Kurilovich, Pavel D. Klots, Andrey Connolly, Thomas Aleiner, Igor L. Kurilovich, Vladislav D. |
| author_facet | Kishmar, Mykola Kurilovich, Pavel D. Klots, Andrey Connolly, Thomas Aleiner, Igor L. Kurilovich, Vladislav D. |
| contents | We develop a theory for two quasiparticle-induced decoherence mechanisms of a driven superconducting qubit. In the first mechanism, an existing quasiparticle (QP) tunnels across the qubit's Josephson junction while simultaneously absorbing a qubit excitation and one (or several) photons from the drive. In the second mechanism, a qubit transition occurs during the non-linear absorption process converting multiple drive quanta into a pair of new QPs. Both mechanisms can remain significant in gap engineered qubits whose coherence is insensitive to QPs without the drive. Our theory establishes a fundamental limitation on fidelity of the microwave qubit operations, such as readout and gates, stemming from QPs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_00769 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quasiparticle-induced decoherence of a driven superconducting qubit Kishmar, Mykola Kurilovich, Pavel D. Klots, Andrey Connolly, Thomas Aleiner, Igor L. Kurilovich, Vladislav D. Quantum Physics Mesoscale and Nanoscale Physics Superconductivity We develop a theory for two quasiparticle-induced decoherence mechanisms of a driven superconducting qubit. In the first mechanism, an existing quasiparticle (QP) tunnels across the qubit's Josephson junction while simultaneously absorbing a qubit excitation and one (or several) photons from the drive. In the second mechanism, a qubit transition occurs during the non-linear absorption process converting multiple drive quanta into a pair of new QPs. Both mechanisms can remain significant in gap engineered qubits whose coherence is insensitive to QPs without the drive. Our theory establishes a fundamental limitation on fidelity of the microwave qubit operations, such as readout and gates, stemming from QPs. |
| title | Quasiparticle-induced decoherence of a driven superconducting qubit |
| topic | Quantum Physics Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2505.00769 |