Low loss hybrid Nb/Au superconducting resonators for quantum circuit applications
- URL: http://arxiv.org/abs/2401.14764v3
- Date: Fri, 30 Aug 2024 11:25:32 GMT
- Title: Low loss hybrid Nb/Au superconducting resonators for quantum circuit applications
- Authors: Marina C. de Ory, Victor Rollano, David Rodriguez, Maria T. Magaz, Daniel Granados, Alicia Gomez,
- Abstract summary: We study a superconducting device combining a niobium circuit with a 10 nm gold capping layer.
Our investigation covers a wide range of temperatures and driving powers, revealing that adding the Au layer reduces the density of two-level system defects.
Our findings suggest the potential of Nb/Au element lumped resonators as versatile and promising tools for advancing superconducting quantum technologies.
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- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Superconducting resonators play a crucial role in developing forthcoming quantum technologies such as quantum computing or high performance detectors. Yet, one of their main limitations regarding to noise and sensitivity is the interaction with two-level systems present in oxide layers in the device. Focused on mitigating this problem, we study a superconducting device combining a niobium circuit with a 10 nm gold capping layer. Our investigation covers a wide range of temperatures and driving powers, revealing that adding the Au layer reduces the density of two-level system defects while maintaining a very high quality factor. Moreover, an increase in the non-linearity response is also observed. Our findings suggest the potential of Nb/Au lumped element resonators as versatile and promising tools for advancing superconducting quantum technologies. Among others, the presence of gold allows anchoring alkyl thiol groups to form self-assembled monolayers, improving the integration with molecular spin qubits for the development of hybrid quantum processors.
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