Tantalum superconducting resonators show a persistent, non-equilibrium quasiparticle density at millikelvin temperatures that is about three times lower than in niobium nitride at the same normalized temperature.
Nonequilibrium quasiparticle distribution in superconducting resonators: An analytical approach,
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On-chip microwave sensing of quasiparticles in tantalum superconducting circuits on silicon for scalable quantum technologies
Tantalum superconducting resonators show a persistent, non-equilibrium quasiparticle density at millikelvin temperatures that is about three times lower than in niobium nitride at the same normalized temperature.