Low loss hybrid Nb/Au superconducting resonators for quantum circuit
applications
- URL: http://arxiv.org/abs/2401.14764v1
- Date: Fri, 26 Jan 2024 10:40:51 GMT
- Title: Low loss hybrid Nb/Au superconducting resonators for quantum circuit
applications
- Authors: Marina C. de Ory, David Rodriguez, Maria T. Magaz, V\'ictor Rollano,
Daniel Granados and Alicia Gomez
- Abstract summary: We have developed a superconducting device combining a niobium (Nb) circuit with a 10 nm gold (Au) capping layer.
The presence of the thin Au layer induces a higher kinetic inductance at low temperatures, leading to enhanced responsivity.
Our findings suggest the potential of Nb/Au lumped element resonators as versatile and promising tools for advancing superconducting quantum technologies.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Superconducting resonators play a crucial role in developing forthcoming
quantum computing schemes. The complete integration of molecular spin-based
quantum bits with superconducting resonators still requires further
developments, notably in maintaining low-loss resonances and high quality
factors. In this work, we have developed a superconducting device combining a
niobium (Nb) circuit with a 10 nm gold (Au) capping layer, which supports low
microwave losses and enables new functionalities such as the integration of
magnetic molecules into solid-state devices. Our investigation across a wide
temperature and driving power range reveals that adding the Au layer reduces
the density of two-level system (TLS) defects present in the device. Moreover,
the presence of the thin Au layer induces a higher kinetic inductance at low
temperatures, leading to enhanced responsivity. Cryogenic characterization
confirms the good performance of the device, allowing these resonators to serve
as platforms for hybrid devices involving molecular spin qubits/gates where the
gold can anchor alkyl thiol groups to form self-assembled monolayers. Our
findings suggest the potential of Nb/Au lumped element resonators (LERs) as
versatile and promising tools for advancing superconducting quantum
technologies and the integration of quantum functionalities into solid-state
devices.
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