https://doi.org/10.1140/epjb/s10051-024-00836-8
Regular Article - Solid State and Materials
On-chip high kinetic inductance LC filters modeled with a distributed circuit model
1
CAS Key Laboratory of Quantum Information, University of Science and Technology of China, 230026, Hefei, Anhui, China
2
CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, 230026, Hefei, Anhui, China
3
Hefei National Laboratory, University of Science and Technology of China, 230088, Hefei, Anhui, China
4
Origin Quantum Computing Company Limited, 230088, Hefei, Anhui, China
Received:
5
July
2024
Accepted:
26
November
2024
Published online:
16
December
2024
In a hybrid system of quantum dots coupled with microwave resonators, to address the large footprints challenge posed by conventional-material on-chip low-pass filters which are inserted to suppress resonator photon leakage, the utilization of filters with high kinetic inductance (HKI) materials has been demonstrated. However, the HKI film induces the distributed parasitic kinetic inductance to the capacitor structure, making the lumped circuit model which generally used to simulate the filter face failure, and hindering the superconducting filter performance. In our work, we fabricate a compact HKI planar filter and observe that the measured response curve exhibits a large deviation from the simulation result of the lumped circuit model. We propose a distributed circuit model to more accurately simulate transmission characteristics of the HKI filter. By analyzing the effect of parasitic inductance induced by the distributed kinetic inductance film, we explain the abnormal roll-off phenomenon observed in the transmission response curve of the HKI filter. Combining the Fano effect, the simulation result with the distributed model exhibits better correspondence with the experimental results than that of the lumped model. The developed circuit model will contribute to analyzing the adverse effects and optimizing the device design of the HKI film.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2024
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
