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Showing 1–6 of 6 results
Advanced filters: Author: Gianluigi Catelani Clear advanced filters

  • Quasiparticles, or broken Cooper pairs, are a major source of decoherence in superconducting qubits but their origin is debated. Pan et al. confirm the dominant mechanism due to photon absorption in the Josephson junction and demonstrate mitigation strategies based on tuning of the qubit geometry.

    • Xianchuang Pan
    • Yuxuan Zhou
    • Dapeng Yu
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-7

  • The standard current–phase relation in tunnel Josephson junctions involves a single sinusoidal term, but real junctions are more complicated. The effects of higher Josephson harmonics have now been identified in superconducting qubit devices.

    • Dennis Willsch
    • Dennis Rieger
    • Ioan M. Pop
    ResearchOpen Access
    Nature Physics
    Volume: 20, P: 815-821

  • The performance of superconducting qubits is often limited by spurious two-level systems. Now, a qubit operating as a heat engine manipulates its bath of nearby two-level systems, providing insights into their dynamics and interactions.

    • Martin Spiecker
    • Patrick Paluch
    • Ioan M. Pop
    Research
    Nature Physics
    Volume: 19, P: 1320-1325

  • Quasiparticle poisoning challenges the operation of superconducting qubits, but errors can be suppressed by engineering gap asymmetry between the electrodes of the qubit’s Josephson junction. The authors present a model of the qubit-quasiparticle system valid beyond the low-temperature limit and identify different nonequilibrium regimes, which can affect the interpretation of experimental data.

    • Giampiero Marchegiani
    • Gianluigi Catelani
    ResearchOpen Access
    Communications Physics
    Volume: 8, P: 1-8