Adding lower-gap aluminum phonon-trap islands around granular aluminum resonators raises single-photon internal quality factors by up to threefold and halves quasiparticle burst rates.
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Phonon traps reduce the quasiparticle density in superconducting circuits
Adding lower-gap aluminum phonon-trap islands around granular aluminum resonators raises single-photon internal quality factors by up to threefold and halves quasiparticle burst rates.