Phonon-mediated quasiparticle poisoning of superconducting microwave resonators

U. Patel, Ivan V. Pechenezhskiy, Britton Plourde, M. G. Vavilov, R. McDermott

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Abstract

Nonequilibrium quasiparticles represent a significant source of decoherence in superconducting quantum circuits. Here we investigate the mechanism of quasiparticle poisoning in devices subjected to local quasiparticle injection. We find that quasiparticle poisoning is dominated by the propagation of pair-breaking phonons across the chip. We characterize the energy dependence of the time scale for quasiparticle poisoning. Finally, we observe that incorporation of extensive normal metal quasiparticle traps leads to a more than order-of-magnitude reduction in quasiparticle loss for a given injected quasiparticle power.

Original languageEnglish (US)
Article number220501
JournalPhysical Review B
Volume96
Issue number22
DOIs
StatePublished - Dec 7 2017

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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