Energy Decay in Superconducting Josephson-Junction Qubits from Nonequilibrium Quasiparticle Excitations

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The dynamics of 'hotspot forming' high-energy quasiparticles in a superconducting nanowire NaturePhysics

, which suggests that nonequilibrium quasiparticles are an important decoherence source for Josephson qubits.

Calculations of the energy-decay and diffusion of quasiparticles also indicate that prior engineered gap and trap structures, which reduce the density of quasiparticles, should be redesigned to improve their efficacy. This model also explains a striking feature in Josephson qubits and resonators—a small

 

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