2022 International Conference on Solid State Devices and Materials

講演情報

Oral Presentation

Focus Session 1 (Area1&2&9)

[C-6] Quantum Computing IV

2022年9月28日(水) 13:30 〜 15:30 103 (1F)

Session Chair: Kae Nemoto (NII), Takashi Tsuchiya (NIMS)

14:30 〜 14:45

[C-6-04] Reducing Microwave Dielectric Losses of Niobium Superconducting Resonators by a Tantalum Cap Layer

〇Yoshiro Urade1, Kunihiro Inomata1, Kay Yakushiji1, Manabu Tsujimoto1, Takahiro Yamada1, Wataru Mizubayashi1 (1. AIST (Japan))

Presentation style: On-site (in-person)

https://doi.org/10.7567/SSDM.2022.C-6-04

Niobium (Nb), a common material for electrodes of state-of-the-art superconducting qubits, experiences large microwave dielectric losses due to its surface oxide. Mitigating such losses of superconducting materials is crucial for improving the quality of superconducting qubits. To this end, we propose adding a tantalum cap layer on a Nb film. Superconducting resonators based on the composite film have been characterized using microwaves, and a significant increase in the internal quality factor of the resonators has been confirmed. The proposed composite film is expected to improve the coherence time of superconducting qubits.

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