Performance Analysis of Superconductor-constriction-Superconductor Transmon Qubits

• URL: http://arxiv.org/abs/2301.04276v4
• Date: Fri, 7 Jun 2024 19:20:51 GMT
• Title: Performance Analysis of Superconductor-constriction-Superconductor Transmon Qubits
• Authors: Mingzhao Liu, Charles T. Black,
• Abstract summary: The superconductor-insulator-superconductor (SIS) Josephson junction is replaced by a co-planar, 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.
• Score: 0.2092728936840121
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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 co-planar, 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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