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Updated: Jul 3, 2026

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A Ge/Si heterostructure nanowire-based double quantum dot with integrated charge sensor.

Yongjie Hu1, Hugh O H Churchill, David J Reilly

  • 1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.

Nature Nanotechnology
|July 26, 2008
PubMed
Summary

Researchers developed a novel solid-state qubit using germanium/silicon core/shell nanowires. This design minimizes nuclear spin interactions, paving the way for more stable quantum computing.

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Area of Science:

  • Solid-state quantum computing
  • Quantum information science
  • Semiconductor spintronics

Background:

  • Solid-state quantum bits (qubits) are proposed using coupled electron spins in semiconductor quantum dots.
  • Existing III-V semiconductor quantum dots suffer from limited electron spin coherence due to hyperfine interactions with nuclear spins.
  • Germanium/Silicon (Ge/Si) core/shell nanowires offer a promising alternative due to their spin-zero nuclei and tunable, defect-free synthesis.

Purpose of the Study:

  • To engineer a double quantum dot system using Ge/Si core/shell nanowires.
  • To demonstrate full control over inter-dot coupling and lead connectivity.
  • To establish a foundation for a nuclear spin-free solid-state qubit.

Main Methods:

  • Fabrication of a double quantum dot device utilizing Ge/Si core/shell nanowires.

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  • Precise control of coupling parameters between the two quantum dots and external leads.
  • Capacitive coupling of the double dot to an adjacent nanowire quantum dot for charge detection.

    • Main Results:

    • Successful implementation of a controllable double quantum dot system in Ge/Si nanowires.
    • Demonstration of sensitive charge detection via capacitive coupling to a nearby quantum dot sensor.
    • Achieved complete control over the coupling between the double dots and to the electrical leads.

    Conclusions:

    • Ge/Si core/shell nanowires provide a viable platform for creating high-coherence solid-state qubits.
    • The developed double quantum dot with an integrated charge sensor is a key component for nuclear spin-free qubits.
    • This work advances the development of robust quantum computing hardware by mitigating decoherence sources.