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Robust poor man’s Majorana zero modes using Yu-Shiba-Rusinov states

Author

Listed:
  • Francesco Zatelli

    (Delft University of Technology)

  • David van Driel

    (Delft University of Technology)

  • Di Xu

    (Delft University of Technology)

  • Guanzhong Wang

    (Delft University of Technology)

  • Chun-Xiao Liu

    (Delft University of Technology)

  • Alberto Bordin

    (Delft University of Technology)

  • Bart Roovers

    (Delft University of Technology)

  • Grzegorz P. Mazur

    (Delft University of Technology)

  • Nick van Loo

    (Delft University of Technology)

  • Jan C. Wolff

    (Delft University of Technology)

  • A. Mert Bozkurt

    (Delft University of Technology)

  • Ghada Badawy

    (Eindhoven University of Technology)

  • Sasa Gazibegovic

    (Eindhoven University of Technology)

  • Erik P. A. M. Bakkers

    (Eindhoven University of Technology)

  • Michael Wimmer

    (Delft University of Technology)

  • Leo P. Kouwenhoven

    (Delft University of Technology)

  • Tom Dvir

    (Delft University of Technology)

Abstract

Kitaev chains in quantum dot-superconductor arrays are a promising platform for the realization of topological superconductivity. As recently demonstrated, even a two-site chain can host Majorana zero modes known as “poor man’s Majorana”. Harnessing the potential of these states for quantum information processing, however, requires increasing their robustness to external perturbations. Here, we form a two-site Kitaev chain using Yu-Shiba-Rusinov states in proximitized quantum dots. By deterministically tuning the hybridization between the quantum dots and the superconductor, we observe poor man’s Majorana states with a gap larger than 70 μeV. The sensitivity to charge fluctuations is also greatly reduced compared to Kitaev chains made with non-proximitized dots. The systematic control and improved energy scales of poor man’s Majorana states realized with Yu-Shiba-Rusinov states will benefit the realization of longer Kitaev chains, parity qubits, and the demonstration of non-Abelian physics.

Suggested Citation

  • Francesco Zatelli & David van Driel & Di Xu & Guanzhong Wang & Chun-Xiao Liu & Alberto Bordin & Bart Roovers & Grzegorz P. Mazur & Nick van Loo & Jan C. Wolff & A. Mert Bozkurt & Ghada Badawy & Sasa G, 2024. "Robust poor man’s Majorana zero modes using Yu-Shiba-Rusinov states," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-52066-2
    DOI: 10.1038/s41467-024-52066-2
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    References listed on IDEAS

    as
    1. Tom Dvir & Guanzhong Wang & Nick Loo & Chun-Xiao Liu & Grzegorz P. Mazur & Alberto Bordin & Sebastiaan L. D. Haaf & Ji-Yin Wang & David Driel & Francesco Zatelli & Xiang Li & Filip K. Malinowski & Sas, 2023. "Realization of a minimal Kitaev chain in coupled quantum dots," Nature, Nature, vol. 614(7948), pages 445-450, February.
    2. Guanzhong Wang & Tom Dvir & Grzegorz P. Mazur & Chun-Xiao Liu & Nick van Loo & Sebastiaan L. D. ten Haaf & Alberto Bordin & Sasa Gazibegovic & Ghada Badawy & Erik P. A. M. Bakkers & Michael Wimmer & L, 2022. "Singlet and triplet Cooper pair splitting in hybrid superconducting nanowires," Nature, Nature, vol. 612(7940), pages 448-453, December.
    3. T. Hensgens & T. Fujita & L. Janssen & Xiao Li & C. J. Van Diepen & C. Reichl & W. Wegscheider & S. Das Sarma & L. M. K. Vandersypen, 2017. "Quantum simulation of a Fermi–Hubbard model using a semiconductor quantum dot array," Nature, Nature, vol. 548(7665), pages 70-73, August.
    4. K. Grove-Rasmussen & G. Steffensen & A. Jellinggaard & M. H. Madsen & R. Žitko & J. Paaske & J. Nygård, 2018. "Yu–Shiba–Rusinov screening of spins in double quantum dots," Nature Communications, Nature, vol. 9(1), pages 1-6, December.
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