Drive photons can re-enable quasiparticle-induced errors in gap-engineered transmons, and multi-photon absorption can create fresh quasiparticles that also corrupt the qubit.
Microwave-assisted QP tunneling — First, we find the rate of qubit transitions due to the QP tunneling assisted by the absorption of one drive photon [process 1 in Fig
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Quasiparticle-induced decoherence of a driven superconducting qubit
Drive photons can re-enable quasiparticle-induced errors in gap-engineered transmons, and multi-photon absorption can create fresh quasiparticles that also corrupt the qubit.