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Controlling the energy spectrum of quantum-coherent superconducting circuits, i.e., the energies of excited states, the circuit anharmonicity, and the states’ charge dispersion, is essential for designing performant qubits. This control is usually achieved by adjusting the circuit’s geometry. In situ control is traditionally obtained via an external magnetic field, in the case of tunnel Josephson junctions. More recently, semiconductor-weak-links-based Josephson junctions have emerged as an alternative building block with the advantage of tunability via the electric-field effect. Gate-tunable Josephson junctions have been succesfully integrated in superconducting circuits using, for instance, semiconducting nanowires or two-dimensional electron gases. In this Letter we demonstrate, in a graphene superconducting circuit, a large gate tunability of qubit properties: frequency, anharmonicity, and charge dispersion. We rationalize these features using a model considering the transmission of Cooper pairs through Andreev bound states. Noticeably, we show that the high transmission of Cooper pairs in such weak link strongly suppresses the charge dispersion. Our Letter illustrates the potential for graphene-based qubits as versatile building blocks in advanced quantum circuits.

権利情報:

• In Copyright
  

  © 2025 American Physical Society

キーワード: Graphene, Josephson junction, Superconducting qubit

刊行年月日: 2025-12-22

出版者: American Physical Society (APS)

掲載誌:

• Physical Review Letters (ISSN: 10797114) vol. 135 issue. 26 266001

研究助成金:

• Agence Nationale de la Recherche ANR-19-CE47-0007
• Agence Nationale de la Recherche ANR-22-PETQ-0003
• Japan Society for the Promotion of Science 21H05233
• Japan Society for the Promotion of Science 23H02052
• Ministry of Education, Culture, Sports, Science and Technology
• World Premier International Research Center Initiative

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI:

公開URL: https://doi.org/10.1103/3gy7-2r3n

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更新時刻: 2026-07-28 11:06:41 +0900

MDRでの公開時刻: 2026-07-28 12:27:23 +0900