Journal article Gate-Tunable Spectrum and Charge Dispersion Mitigation in a Graphene Superconducting Qubit
Nicolas Aparicio (author) (Search by this author)
;
Simon Messelot (author) (Search by this author)
;
Edgar Bonet-Orozco (author) (Search by this author)
;
Eric Eyraud (author) (Search by this author)
;
Kenji Watanabe (author) (Search by this author)
ORCID https://orcid.org/0000-0003-3701-8119
National Institute for Materials Science
SAMURAI NIMS Researchers Directory SAMURAI
ORCID SAMURAI ;
Takashi Taniguchi (author) (Search by this author)
ORCID https://orcid.org/0000-0002-1467-3105
National Institute for Materials Science
SAMURAI NIMS Researchers Directory SAMURAI
ORCID SAMURAI ;
Johann Coraux (author) (Search by this author)
;
Julien Renard (author) (Search by this author)
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Citation
Nicolas Aparicio, Simon Messelot, Edgar Bonet-Orozco, Eric Eyraud, Kenji Watanabe, Takashi Taniguchi, Johann Coraux, Julien Renard. Gate-Tunable Spectrum and Charge Dispersion Mitigation in a Graphene Superconducting Qubit. Physical Review Letters. 2025, 135 (26), 266001. https://doi.org/10.1103/3gy7-2r3n

Description:

(abstract)

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.

Rights:

Keyword: Graphene, Josephson junction, Superconducting qubit

Date published: 2025-12-22

Publisher: American Physical Society (APS)

Journal:

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

Funding:

  • 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

Manuscript type: Author's version (Accepted manuscript)

MDR DOI:

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

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Updated at: 2026-07-28 11:06:41 +0900

Published on MDR: 2026-07-28 12:27:23 +0900

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