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We investigate superconducting granular aluminum (grAl) as a promising material for quantum circuits. We show that grAl strips can reach kinetic inductances up to nH/sq, while maintaining small microwave frequency losses. We identify excess quasiparticles as a limiting loss mechanism, and find quasiparticle relaxation times on the order of seconds. By fabricating a fluxonium quantum bit with a grAl superinductor, we demonstrate that grAl is a viable material for superconducting quantum circuits.
Umfang: VIII, 146 S.
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Grünhaupt, L. 2019. Granular aluminium superinductors. Karlsruhe: KIT Scientific Publishing. DOI: https://doi.org/10.5445/KSP/1000097320
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Veröffentlicht am 24. Oktober 2019
Englisch
170
| Paperback | 978-3-7315-0956-1 |