Coherent spin qubit shuttling through germanium quantum dots

ORAL

Abstract

Quantum links can interconnect qubit registers and are therefore essential in networked quantum computing. Semiconductor quantum dot qubits have seen significant progress in the high-fidelity operation of small qubit registers but establishing a compelling quantum link remains a challenge. Here, we show that a spin qubit can be shuttled through multiple quantum dots while preserving its quantum information. Remarkably, we achieve these results using hole spin qubits in germanium, despite the presence of strong spin-orbit interaction. We accomplish the shuttling of spin basis states over effective lengths beyond 300 μm and demonstrate the coherent shuttling of superposition states over effective lengths corresponding to 9 μm, which we can extend to 49 μm by incorporating dynamical decoupling. These findings indicate qubit shuttling as an effective approach to route qubits within registers and to establish quantum links between registers.

*We acknowledge support through two projectruimtes and a Vidi grant, associated with the Netherlands Organization of Scientific Research (NWO), and an ERC Starting Grant. Research was sponsored by the Army Research Office (ARO) and was accomplished under Grant No. W911NF- 17-1-0274. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Office (ARO), or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein. This work is part of the 'Quantum Inspire – the Dutch Quantum Computer in the Cloud' project (with project number [NWA.1292.19.194]) of the NWA research program 'Research on Routes by Consortia (ORC)', which is funded by the Netherlands Organization for Scientific Research (NWO).

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Publication: Preprint: Coherent spin qubit shuttling through germanium quantum dots
https://arxiv.org/abs/2308.02406

Presenters

  • Corentin Déprez

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

Authors

  • Corentin Déprez

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Floor van Riggelen-Doelman

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Chien-An Wang

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Sander L de Snoo

    • TU Delft
    • QuTech
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • William Iain L Lawrie

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • University of Copenhagen

  • Nico W Hendrickx

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Maximilian Rimbach-Russ

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Amir Sammak

    • QuTech
    • QuTech and TNO Netherlands Organization for Applied Scientific Research
    • TNO/QuTech
    • Delft University of Technology
    • TNO
    • QuTech/TNO
    • QuTech and Netherlands Organization for Applied Scientific Research (TNO), The Netherlands
    • QuTech and Netherlands Organisation for Applied Scientific Research (TNO)

  • Giordano Scappucci

    • TU Delft QuTech
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • TU Delft
    • QuTech and Kavli Institute of Nanoscience, TU Delft, The Netherlands

  • Menno Veldhorst

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • Delft University of Technology