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Gate-controlled quantum dots and superconductivity in planar germanium

Author

Listed:
  • N. W. Hendrickx

    (Delft University of Technology)

  • D. P. Franke

    (Delft University of Technology)

  • A. Sammak

    (QuTech and the Netherlands Organisation for Applied Scientific Research (TNO))

  • M. Kouwenhoven

    (Delft University of Technology)

  • D. Sabbagh

    (Delft University of Technology)

  • L. Yeoh

    (Delft University of Technology)

  • R. Li

    (Delft University of Technology)

  • M. L. V. Tagliaferri

    (Delft University of Technology)

  • M. Virgilio

    (Università di Pisa)

  • G. Capellini

    (Università degli studi Roma Tre
    IHP)

  • G. Scappucci

    (Delft University of Technology)

  • M. Veldhorst

    (Delft University of Technology)

Abstract

Superconductors and semiconductors are crucial platforms in the field of quantum computing. They can be combined to hybrids, bringing together physical properties that enable the discovery of new emergent phenomena and provide novel strategies for quantum control. The involved semiconductor materials, however, suffer from disorder, hyperfine interactions or lack of planar technology. Here we realise an approach that overcomes these issues altogether and integrate gate-defined quantum dots and superconductivity into germanium heterostructures. In our system, heavy holes with mobilities exceeding 500,000 cm2 (Vs)−1 are confined in shallow quantum wells that are directly contacted by annealed aluminium leads. We observe proximity-induced superconductivity in the quantum well and demonstrate electric gate-control of the supercurrent. Germanium therefore has great promise for fast and coherent quantum hardware and, being compatible with standard manufacturing, could become a leading material for quantum information processing.

Suggested Citation

  • N. W. Hendrickx & D. P. Franke & A. Sammak & M. Kouwenhoven & D. Sabbagh & L. Yeoh & R. Li & M. L. V. Tagliaferri & M. Virgilio & G. Capellini & G. Scappucci & M. Veldhorst, 2018. "Gate-controlled quantum dots and superconductivity in planar germanium," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-05299-x
    DOI: 10.1038/s41467-018-05299-x
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    Cited by:

    1. Marco Valentini & Oliver Sagi & Levon Baghumyan & Thijs Gijsel & Jason Jung & Stefano Calcaterra & Andrea Ballabio & Juan Aguilera Servin & Kushagra Aggarwal & Marian Janik & Thomas Adletzberger & Rub, 2024. "Parity-conserving Cooper-pair transport and ideal superconducting diode in planar germanium," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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