Quasiparticle-induced decoherence of a driven superconducting qubit

• URL: http://arxiv.org/abs/2505.00769v1
• Date: Thu, 01 May 2025 18:00:42 GMT
• Title: Quasiparticle-induced decoherence of a driven superconducting qubit
• Authors: Mykola Kishmar, Pavel D. Kurilovich, Andrey Klots, Thomas Connolly, Igor L. Aleiner, Vladislav D. Kurilovich,
• Abstract summary: We develop a theory for two quasiparticle-induced decoherence mechanisms of a driven superconducting qubit.<n>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.<n>In the second mechanism, a qubit transition occurs during the non-linear absorption process converting multiple drive quanta into a pair of new QPs.
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• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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.

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