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.
Lienhardet al., in2019 IEEE MTT-S International Microwave Symposium (IMS)(IEEE, Boston, MA, 2019) pp
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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.