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Intrinsic quality factors approaching 10 million in superconducting planar resonators enabled by spiral geometry

Yusuke Tominaga, Shotaro Shirai, Yuji Hishida, Hirotaka Terai and Atsushi Noguchi

EPJ Quantum Technol., 12 1 (2025) 60

DOI: https://doi.org/10.1140/epjqt/s40507-025-00367-w

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