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The carbon nanotube gatemon qubit

Author

Listed:
  • H. Riechert

    (Institut Polytechnique de Paris)

  • S. Annabi

    (Institut Polytechnique de Paris)

  • A. Peugeot

    (Institut Polytechnique de Paris
    Laboratoire de Physique)

  • H. Duprez

    (Institut Polytechnique de Paris)

  • M. Hantute

    (Institut Polytechnique de Paris)

  • K. Watanabe

    (National Institute for Materials Science)

  • T. Taniguchi

    (National Institute for Materials Science)

  • E. Arrighi

    (Institut Polytechnique de Paris)

  • J. Griesmar

    (Institut Polytechnique de Paris)

  • J.-D. Pillet

    (Institut Polytechnique de Paris)

  • L. Bretheau

    (Institut Polytechnique de Paris)

Abstract

Gate-tunable transmon qubits are based on quantum conductors used as weak links within hybrid Josephson junctions. These gatemons have been implemented in just a handful of systems, all relying on extended conductors, namely epitaxial semiconductors or exfoliated graphene. Here we present the coherent control of a gatemon based on a single molecule, a one-dimensional carbon nanotube, which is integrated into a circuit quantum electrodynamics architecture. The measured qubit spectrum can be tuned with a gate voltage and reflects the quantum dot behavior of the nanotube. Our ultraclean integration, using a hexagonal boron nitride substrate, results in record coherence times of 200 ns for carbon nanotube-based qubits. Furthermore, we investigate its decoherence mechanisms, thus revealing a strong gate dependence and identifying charge noise as a limiting factor. On top of positioning carbon nanotubes as contenders for future quantum technologies, our work paves the way for studying microscopic fermionic processes in low-dimensional quantum conductors.

Suggested Citation

  • H. Riechert & S. Annabi & A. Peugeot & H. Duprez & M. Hantute & K. Watanabe & T. Taniguchi & E. Arrighi & J. Griesmar & J.-D. Pillet & L. Bretheau, 2025. "The carbon nanotube gatemon qubit," Nature Communications, Nature, vol. 16(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-62283-y
    DOI: 10.1038/s41467-025-62283-y
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