The carbon nanotube gatemon qubit

H. Riechert, S. Annabi, A. Peugeot, H. Duprez, M. Hantute, K. Watanabe, T. Taniguchi, E. Arrighi, J. Griesmar, J.-D. Pillet () and L. Bretheau ()
Additional contact information
H. Riechert: Institut Polytechnique de Paris
S. Annabi: Institut Polytechnique de Paris
A. Peugeot: Institut Polytechnique de Paris
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

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: 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.

Date: 2025
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DOI: 10.1038/s41467-025-62283-y

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