Improved IR shielding reduces quasiparticle-induced parity switching to 0.069 Hz, yielding a quasiparticle density of 1.88×10^{-11} per Cooper pair—the lowest reported.
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Suppression of Quasiparticle Poisoning to $10^{-11}$ Levels in Superconducting Qubits via Infrared Shielding
Improved IR shielding reduces quasiparticle-induced parity switching to 0.069 Hz, yielding a quasiparticle density of 1.88×10^{-11} per Cooper pair—the lowest reported.