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Description:

The narrow band gaps of semiconductors allow for thick, uniform Josephson junction barriers, potentially enabling reproducible, stable, and compact superconducting qubits. We study vertically stacked van der Waals Josephson junctions with semiconducting weak links, whose crystalline structures and clean interfaces offer a promising platform for quantum devices. We observe robust Josephson coupling across 2–12 nm (3–18 atomic layers) of semiconducting WSe2 and, notably, a crossover from proximity- to tunneling-type behavior with increasing weak-link thickness. Building on these results, we fabricate a prototype all-crystalline merged-element transmon qubit with transmon frequency and anharmonicity closely matching design parameters. We demonstrate dispersive coupling between this transmon and a microwave resonator, highlighting the potential of crystalline superconductor-semiconductor structures for compact, tailored superconducting quantum devices.

Rights:

• In Copyright
  

  ©2026 American Physical Society

Keyword: Josephson junction, van der Waals heterostructure, Transmon qubit

Date published: 2025-09-05

Publisher: American Physical Society (APS)

Journal:

• Physical Review Applied (ISSN: 23317019) vol. 24 issue. 3 034016

Funding:

• National Science Foundation
• Materials Research Science and Engineering Center DMR-2011738
• Materials Research Science and Engineering Center 2235276
• MEXT, Japan
• Gordon and Betty Moore Foundation’s EPiQS Initiative GBMF10277
• National Research Foundation of Korea
• JSPS KAKENHI 21H05233
• JSPS KAKENHI 23H02052
• Army Research Office W911NF-22-C-0021

Manuscript type: Author's version (Accepted manuscript)

MDR DOI:

First published URL: https://doi.org/10.1103/3ssz-jjt6

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Updated at: 2026-07-02 15:49:51 +0900

Published on MDR: 2026-07-02 18:28:22 +0900