Ta encapsulation of Nb resonators raises internal quality factor to 2.4 million and improves six-month stability by reducing two-level system losses at the metal-air interface.
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Tantalum-Encapsulated Niobium Superconducting Resonators: High Internal Quality Factor and Improved Temporal Stability via Surface Passivation
Ta encapsulation of Nb resonators raises internal quality factor to 2.4 million and improves six-month stability by reducing two-level system losses at the metal-air interface.