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Single-Electron Occupation in Quantum Dot Arrays at Selectable Plunger Gate Voltage

Journal Article (2023)
Author(s)

Marcel Meyer (TU Delft - QCD/Veldhorst Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)

Corentin Déprez (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QCD/Veldhorst Lab)

Ilja N. Meijer (Student TU Delft, Kavli institute of nanoscience Delft)

Florian K. Unseld (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Vandersypen Lab)

Saurabh Karwal (TU Delft - QuTech Advanced Research Centre, TU Delft - BUS/TNO STAFF, TNO)

Amir Sammak (TNO, TU Delft - QuTech Advanced Research Centre, TU Delft - BUS/TNO STAFF)

Giordano Scappucci (TU Delft - QCD/Scappucci Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)

Lieven M.K. Vandersypen (TU Delft - QN/Vandersypen Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)

Menno Veldhorst (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QN/Veldhorst Lab)

Research Institute
QuTech Advanced Research Centre
DOI related publication
https://doi.org/10.1021/acs.nanolett.3c03349
More Info
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Publication Year
2023
Language
English
Research Institute
QuTech Advanced Research Centre
Journal title
Nano Letters
Issue number
24
Volume number
23
Pages (from-to)
11593-11600
Downloads counter
301
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Abstract

The small footprint of semiconductor qubits is favorable for scalable quantum computing. However, their size also makes them sensitive to their local environment and variations in the gate structure. Currently, each device requires tailored gate voltages to confine a single charge per quantum dot, clearly challenging scalability. Here, we tune these gate voltages and equalize them solely through the temporary application of stress voltages. In a double quantum dot, we reach a stable (1,1) charge state at identical and predetermined plunger gate voltage and for various interdot couplings. Applying our findings, we tune a 2 × 2 quadruple quantum dot such that the (1,1,1,1) charge state is reached when all plunger gates are set to 1 V. The ability to define required gate voltages may relax requirements on control electronics and operations for spin qubit devices, providing means to advance quantum hardware.