Geometry dependence of two-level-system noise and loss in 
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Kouwenhoven, K.; van Doorn, G.P.J.; Buijtendorp, B.T.; de Rooij, S.A.H.; Lamers, D.; Thoen, D.J.; Murugesan, V.; Baselmans, J.J.A.; de Visser, P.J.

doi:10.1103/physrevapplied.21.044036

Phys. Rev. Applied

2024

DOI: 10.1103/physrevapplied.21.044036

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Geometry dependence of two-level-system noise and loss in a - SiC : H<

K. Kouwenhoven,

G.P.J. van Doorn,

B.T. Buijtendorp

et al.

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Low-characteristic-impedance superconducting tadpole resonators in the sub-gigahertz regime

Rasola,

Klaver,

et al. 2024

Phys. Rev. Research

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We demonstrate a simple and versatile resonator design based on a short strip of a typical coplanar waveguide shorted at one end to the ground and shunted at the other end with a large parallel-plate capacitor. Due to the shape of the structure, we coin it the tadpole resonator. The design allows tailoring the characteristic impedance of the resonator to especially suit applications requiring low values. We demonstrate characteristic impedances ranging from Zc=2 to 10Ω and a frequency range from fr=290MHz to 1.1GHz while reaching internal quality factors of order Qint=8.5×103 translating into a loss tangent of tan(δ)=1.2×10−4 for the aluminum oxide used as the dielectric in the parallel-plate capacitor. We conclude that these tadpole resonators are well suited for applications requiring low frequency and low characteristic impedance while maintaining a small footprint on chip. The low characteristic impedance of the tadpole resonator renders it a promising candidate for achieving strong inductive coupling to other microwave components. Published by the American Physical Society 2024

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Low-characteristic-impedance superconducting tadpole resonators in the sub-gigahertz regime

Rasola,

Klaver,

et al. 2024

Phys. Rev. Research

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show abstract

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Geometry dependence of two-level-system noise and loss in a - SiC : H<

Cited by 1 publication

References 32 publications

Low-characteristic-impedance superconducting tadpole resonators in the sub-gigahertz regime

Low-characteristic-impedance superconducting tadpole resonators in the sub-gigahertz regime

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