Granular superconductors for high kinetic inductance and low loss quantum devices

Aviv Glezer Moshe, Eli Farber, Guy Deutscher

Research output: Contribution to journalArticlepeer-review

Abstract

Granular aluminum is a promising material for high kinetic inductance devices such as qubit circuits. It has the advantage over atomically disordered materials such as NbNx, to maintain a high kinetic inductance concomitantly with a high quality factor. We show that high quality nano-scale granular aluminum films having a sharp superconducting transition with normal state resistivity values on the order of 1 × 10 5 μ ω cm and kinetic inductance values on the order of 10 n H / □ can be obtained, surpassing the state-of-the-art values. We argue that this is a result of the different nature of the metal-to-insulator transition, being electronic correlations driven (Mott type) in the former and disorder driven (Anderson type) in the latter.

Original languageEnglish
Article number062601
JournalApplied Physics Letters
Volume117
Issue number6
DOIs
StatePublished - 10 Aug 2020

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