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Quasiparticle-induced transitions in a fluxonium qubit
Maksim Litskevich, Kesavan Manivannan, Benjamin Byrd +4
Quasiparticles are a prominent decoherence source in superconducting qubits, but their effects are notoriously difficult to isolate in fluxonium. Unlike the transmon, fluxonium is…
Recovery dynamics of a gap-engineered transmon after a quasiparticle burst
Heekun Nho, Thomas Connolly, Pavel D. Kurilovich +4
Ionizing radiation impacts create bursts of quasiparticle density in superconducting qubits. These bursts temporarily degrade qubit coherence which can be detrimental for quantum e…
Characterization of drive-induced unwanted state transitions in superconducting circuits
W. Dai, S. Hazra, D. K. Weiss +11
Microwave drives are essential for implementing control and readout operations in superconducting quantum circuits. However, increasing the drive strength eventually leads to unwan…
A transmon qubit realized by exploiting the superconductor-insulator transition
C. G. L. Bøttcher, E. Ãnder, T. Connolly +8
Superconducting qubits are among the most promising platforms for realizing practical quantum computers. One requirement to create a quantum processor is nonlinearity, which in sup…
Quasiparticle-induced decoherence of a driven superconducting qubit
Mykola Kishmar, Pavel D. Kurilovich, Andrey Klots +3
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 th…
Full characterization of measurement-induced transitions of a superconducting qubit
Thomas Connolly, Pavel D. Kurilovich, Vladislav D. Kurilovich +12
Repeated quantum non-demolition measurement is a cornerstone of quantum error correction protocols. In superconducting qubits, the speed of dispersive state readout can be enhanced…