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복잡계 이론물리 연구단
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Circuit quantum electrodynamics of granular aluminum resonators

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Title
Circuit quantum electrodynamics of granular aluminum resonators
Author(s)
Maleeva N.; Grünhaupt L.; Klein T.; Levy-Bertrand F.; Dupre O.; Calvo M.; Valenti F.; Winkel P.; Friedrich F.; Wernsdorfer W.; Ustinov A.V.; Rotzinger H.; Monfardini A.; Fistul M.V.; Pop I.M.
Publication Date
2018-09
Journal
NATURE COMMUNICATIONS, v.9, no.1, pp.3889 -
Publisher
NATURE PUBLISHING GROUP
Abstract
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. © 2018, The Author(s)
URI
https://pr.ibs.re.kr/handle/8788114/4924
ISSN
2041-1723
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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