| Title: |
Three-dimensional niobium coaxial cavity with 0.1-second lifetime |
| Authors: |
Takenaka, Takaaki; Kubo, Takayuki; Mahboob, Imran; Mizuno, Kosuke; Inoue, Hitoshi; Saeki, Takayuki; Saito, Shiro |
| Contributors: |
JST Moonshot R&D; JSPS KAKENHI |
| Source: |
Physical Review Applied ; volume 25, issue 3 ; ISSN 2331-7019 |
| Publisher Information: |
American Physical Society (APS) |
| Publication Year: |
2026 |
| Description: |
We report on the internal quality factor of a three-dimensional niobium quarter-wave coaxial cavity that has undergone mid-temperature annealing, exhibiting at the single-photon level below 20 mK, which corresponds to an internal photon lifetime of . Moreover, of the mid-temperature-annealed cavities remains almost unchanged even after several cooldown cycles and air exposure. These results suggest that stable low-loss niobium oxides are formed by mid-temperature annealing on the surface of a three-dimensional niobium cavity. This surface treatment could be applicable to the fabrication of two-dimensional superconducting circuits and help improve the lifetime of -based superconducting qubits. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.1103/5nf2-tjb9 |
| DOI: |
10.1103/5nf2-tjb9/fulltext |
| Availability: |
https://doi.org/10.1103/5nf2-tjb9; https://link.aps.org/article/10.1103/5nf2-tjb9; http://harvest.aps.org/v2/journals/articles/10.1103/5nf2-tjb9/fulltext |
| Rights: |
https://creativecommons.org/licenses/by/4.0/ |
| Accession Number: |
edsbas.27FA68B |
| Database: |
BASE |