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Article Dans Une Revue Nature Communications Année : 2018

Circuit quantum electrodynamics of granular aluminum resonators

Résumé

Granular aluminum (grAl) is a promising high kinetic inductance material for detectors, amplifiers, and qubits. Here we model the grAl structure, consisting of pure aluminum grains separated by thin aluminum oxide barriers, as a network of Josephson junctions, and we calculate the dispersion relation and nonlinearity (self-Kerr and cross-Kerr coefficients). To experimentally study the electrodynamics of grAl thin films, we measure microwave resonators with open-boundary conditions and test the theoretical predictions in two limits. For low frequencies, we use standard microwave reflection measurements in a low-loss environment. The measured low-frequency modes are in agreement with our dispersion relation model, and we observe self-Kerr coefficients within an order of magnitude from our calculation starting from the grAl microstructure. Using a high-frequency setup, we measure the plasma frequency of the film around 70 GHz, in agreement with the analytical prediction.
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Dates et versions

hal-01886934 , version 1 (15-12-2023)

Identifiants

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N. Maleeva, L. Grünhaupt, T. Klein, F. Levy-Bertrand, O. Dupré, et al.. Circuit quantum electrodynamics of granular aluminum resonators. Nature Communications, 2018, 9, pp.3889. ⟨10.1038/s41467-018-06386-9⟩. ⟨hal-01886934⟩

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