Towards a mechanical qubit in a carbon nanotube

ORAL

Abstract

Mechanical resonators based on carbon nanotubes are an exceptional platform to study the coupling between mechanical motion[1] and electron transport[2]. Recently, it has been shown that the second flexural mode of a carbon nanotube mechanical resonator may be coupled to a double quantum dot interdot transition[3]. In the ultra-strong coupling limit, the electron transition induces enough anharmonicity in the energy dispersion curve of the harmonic oscillator that the system can be used as a qubit[4].

In our work, we develop a reliable process to fabricate compact multi-electrode circuits that can sustain the harsh conditions of the nanotube growth. We measure high quality charge stability diagrams for double-quantum dots which may be coupled to the mechanical motion of the nanotube. We also discuss the read-out scheme for the future qubit.

[1] J. Moser et al., Nat. Nanotech. 9, 1007 (2014).

[2] W. Yang et al. PRL, 125, 187701 (2020)

[3] I. Khivrich, A. A. Clerk and S. Ilani, Nat. Nanotech., 14, 161-167 (2019).

[4] F. Pistolesi, et al., PRX 11, 031027 (2021)

*We acknowledge support from ERC Advanced Grant No. 692876 and MICINN Grant No. RTI2018-097953-B-I00. Work performed at the Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility, was supported by the U.S. DOE, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. We also acknowledge the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska Curie grant agreement nos. 847517 and 101023289, AGAUR (Grant No. 2017SGR1664), the Quantera grant (PCI2022-132951), the Fondo Europeo de Desarrollo, the Spanish Ministry of Economy and Competitiveness through CEX2019-000910-S [MCIN/AEI/10.13039/501100011033], Recovery, Transformation and Resilience Plan-Funded by the European Union- NextGenerationEU, Quantum CCAA, Fundacio Cellex, Fundacio Mir-Puig, Generalitat de Catalunya through CERCA.

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Publication: Proposal for a Nanomechanical Qubit. F. Pistolesi, A.?N. Cleland, and A.
Bachtold Phys. Rev. X 11, 031027 – Published 3 August 2021

Presenters

  • Roger Tormo Queralt

    • The institute of Photonic Sciences (ICFO)

Authors

  • Roger Tormo Queralt

    • The institute of Photonic Sciences (ICFO)

  • Adrian Bachtold

    • The institute of Photonic Sciences (ICFO)
    • ICFO – The Institute of Photonic Sciences

  • Christoffer B Moller

    • ICFO-The Institute of Photonic Sciences

  • Andrew N Cleland

    • University of Chicago

  • David Czaplewski

    • Argone National Laboratory
    • Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL 60439, USA

  • Fabio Pistolesi

    • Université de Bordeaux
    • Université de Bordeaux, CNRS, LOMA, UMR 5798, F-33400 Talence, France

  • chandan Samantha

    • The institute of Photonic Sciences (ICFO)

  • Sergio Lucio de Bonis

    • The institute of Photonic Sciences (ICFO)

  • Sergio Lucio de Bonis

    • The institute of Photonic Sciences (ICFO)

  • Sergio Lucio de Bonis

    • The institute of Photonic Sciences (ICFO)