Energy decay and frequency shift of a superconducting qubit from non-equilibrium quasiparticles

Details Energy decay and frequency shift of a superconducting qubit from non-equilibrium quasiparticles Energy decay and frequency shift of a superconducting qubit from non-equilibrium quasiparticles

2011-01-05

arxiv.org/abs/1101.0862v1

Phys. Rev. B 84, 024501 (2011)

Physics

Condensed Matter

Superconductivity

Main paper: 4 pages, 3 figures, 1 table. Supplementary material: 8 pages, 3 figures

Scientific paper

10.1103/PhysRevB.84.024501

Quasiparticles are an important decoherence mechanism in superconducting qubits, and can be described with a complex admittance that is a generalization of the Mattis-Bardeen theory. By injecting non-equilibrium quasiparticles with a tunnel junction, we verify qualitatively the expected change of the decay rate and frequency in a phase qubit. With their relative change in agreement to within 4% of prediction, the theory can be reliably used to infer quasiparticle density. We describe how settling of the decay rate may allow determination of whether qubit energy relaxation is limited by non-equilibrium quasiparticles.

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