A Nanomechanical Qubit in a Carbon Nanotube

ORAL

Abstract

We present our efforts towards realizing the first ever mechanical qubit [1]. We employ a suspended carbon nanotube and present measurements of a strong mechanical nonlinearity near the quantum ground state [2]. The mechanical nonlinearity is generated by the ultrastrong coupling (500MHz) of a carbon nanotube mechanical resonator (30MHz) to an embedded quantum dot undergoing single-electron tunneling. The nonlinearity is far bigger than what has been realized thus far and results in highly nonlinear thermal vibrations.

The coherence may be enhanced by gating the nanotube using a multigate architecture [3] and coupling the mechanical vibrations to an embedded double quantum dot charge qubit. We present measurements of this charge qubit and the coupling of mechanical vibrations to it. The hybrid system is read-out using a dispersively coupled superconducting microwave cavity.

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

[2] C. Samanta, S. L. deBonis, C. B. Moller et al., Nature Physics (2023).

[3] R. Tormo-Queralt, C. B. Moller et al, Nano Letters (2022).

* We acknowledge support from ERC Advanced Grant No. 692876 and Feedback and SupportMICINN 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 (PRTR-C17.I1), Quantum CCAA, Fundacio Cellex, Fundacio MirPuig, Generalitat de Catalunya through CERCA.

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Publication: C. Samanta et al., S. L. deBonis, C. B. Moller et al., Nonlinear nanomechanical resonators approaching the quantum ground state, Nature Physics (2023).

R. Tormo-Queralt, C. B. Moller et al, Novel nanotube multi-quantum dot devices, Nano Letters (2022).

Presenters

  • Christoffer B Moller

    ICFO-The Institute of Photonic Sciences

Authors

  • Christoffer B Moller

    ICFO-The Institute of Photonic Sciences

  • Roger Tormo Queralt

    The institute of Photonic Sciences (ICFO)

  • Victor Roman

    ICFO-The Institute of Photonic Sciences, ICFO

  • Chandan Samanta

    ICFO-The Institute of Photonic Sciences

  • Sergio L De Bonis

    ICFO-The Institute of Photonic Sciences

  • Fabio Pistolesi

    CNRS, LOMA, UMR

  • David A Czaplewski

    Argonne National Laboratory, 2Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, Argonne, Nanoscience and Technology Center for Nanoscale Materials, Argonne National Laboratory, Vermont, IL, USA

  • Andrew N Cleland

    University of Chicago

  • Adrian Bachtold

    ICFO - Institut De Ciencies Fotoniques, ICFO- The Institute of Photonic Sciences, ICFO-The Institute of Photonic Sciences, ICFO