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DOE OSTI · 2407557

Performance analysis of superconductor-constriction-superconductor transmon qubits

Liu, Mingzhao·Black, Charles T.
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Abstract

Here, this work presents a computational analysis of a superconducting transmon qubit design, in which the superconductor-insulator-superconductor (SIS) Josephson junction is replaced by a coplanar, superconductor-constriction-superconductor (ScS) nanobridge junction. Within the scope of Ginzburg-Landau theory, we find that the nanobridge ScS transmon has an improved charge dispersion compared to the SIS transmon, with a tradeoff of smaller anharmonicity. These calculations provide a framework for estimating the superconductor material properties and junction dimensions compatible with gigahertz frequency ScS transmon operation.

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36 MATERIALS SCIENCE

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Liu, Mingzhao, Black, Charles T.. 2024-07-09. Performance analysis of superconductor-constriction-superconductor transmon qubits. https://doi.org/10.1103/physreva.110.012427

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36 MATERIALS SCIENCE↗