We present a technique for integrating ultraclean carbon nanotubes into superconducting circuits, aiming to realize Josephson junctions based on one-dimensional elementary quantum conductors. This technique primarily involves depositing the nanotube in the final step, thus preserving it from the inherent contaminations of nanofabrication and maintaining contact solely with superconducting electrodes and a crystalline hBN substrate. Through transport measurements performed in both the normal and superconducting states, we demonstrate that our method yields high-quality junctions with Josephson energies suitable for quantum device applications, such as carbon nanotube-based superconducting qubits.
@article{arxiv.2405.19192,
title = {Josephson junctions based on ultraclean carbon nanotubes},
author = {S. Annabi and E. Arrighi and A. Peugeot and H. Riechert and J. Griesmar and K. Watanabe and T. Taniguchi and L. Bretheau and J. -D. Pillet},
journal= {arXiv preprint arXiv:2405.19192},
year = {2024}
}