Electrostatic uniformity and two-dimensional quantum dot arrays in silicon

ORAL

Abstract

Engineering highly uniform two-dimensional quantum dot arrays might be an essential requirement for building a scalable quantum processor based on silicon spin qubits. Here we show tuneable tunnel couplings in a silicon 2x2 quantum dot array operated in the single electron regime. In such a device we can compensate fluctuations in the electrostatic environment by applying individual gate voltages for each quantum dot. However, scaling this approach to larger arrays would lead to excessive overheads in tuning and control electronics. Therefore, we developed a method to electrically increase the potential uniformity in heterostructure quantum wells. We demonstrate that pinch-off voltages in quantum dot devices can be tuned over hundreds of millivolts and that they remain stable for hours afterward. Applying our method, we homogenize the pinch-off voltages of the plunger gates in a linear array for four quantum dots and reduce their spread by one order of magnitude. This work offers a new tool for the tuning of spin qubit devices providing perspectives for the implementation of scalable spin qubit arrays.

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Presenters

  • Marcel Meyer

    • Delft University of Technology

Authors

  • Marcel Meyer

    • Delft University of Technology

  • Florian K Unseld

    • Delft University of Technology

  • Corentin Déprez

    • Delft University of Technology

  • Timo v Abswoude

    • Delft University of Technology

  • Dingshan Liu

    • Delft University of Technology

  • Chien-An Wang

    • Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands

  • Mateusz T Madzik

    • Delft University of Technology
    • QuTech and the Kavli Institute of Nanoscience, Delft University of Technology
    • Intel
    • University of New South Wales
    • QuTech

  • Saurabh Karwal

    • TNO, Qutech
    • Netherlands Organisation for Applied Scientific Research (TNO)
    • TNO/QuTech

  • Stefan Oosterhout

    • Netherlands Organisation for Applied Scientific Research (TNO)
    • Netherlands Organization for Applied Scientific Research (TNO)

  • Sergey V Amitonov

    • Netherlands Organisation for Applied Scientific Research (TNO)

  • Larysa Tryputen

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

  • Francesco Borsoi

    • Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands

  • Amir Sammak

    • TNO, Qutech
    • QuTech and TNO, Stieltjesweg 1, 2628 CK Delft, The Netherlands
    • Netherlands Organisation for Applied Scientific Research (TNO)
    • QuTech and Netherlands Organization for Applied Scientific Research (TNO), Delft, The Netherlands
    • TNO, QuTech
    • TNO
    • Netherlands Organization for Applied Scientific Research (TNO)
    • QuTech and Netherlands Organisation for Applied Scientific Research (TNO), Stieltjesweg 1, 2628 CK Delft, The Netherlands
    • TNO/QuTech

  • Nico Hendrickx

    • IBM Research
    • IBM Research Europe - Zurich
    • Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands

  • Giordano Scappucci

    • QuTech and Kavli Institute of Nanoscience, TU Delft, P.O. Box 5046, 2600 GA Delft, The Netherlands
    • Delft University of Technology
    • QuTech and the Kavli Institute of Nanoscience, Delft University of Technology
    • TU Delft QuTech
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands

  • Lieven M Vandersypen

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

  • Menno Veldhorst

    • Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands