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Indirect interaction of solid-state qubits via two-dimensional electron gas.

D Mozyrsky1, V Privman, M L Glasser

  • 1Department of Physics, Clarkson University, Potsdam, New York 13699-5820, USA.

Physical Review Letters
|June 1, 2001
PubMed
Summary

We present a novel quantum computing mechanism for long-range coupling of nuclear spin qubits in semiconductor devices. This approach enables qubit spacing up to 100 nm, enhancing scalability for quantum information processing.

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Area of Science:

  • Quantum Computing
  • Semiconductor Physics
  • Spintronics

Background:

  • Nuclear spin qubits are promising for quantum information processing.
  • Achieving long-range coherent coupling between qubits is a key challenge.
  • Current methods face limitations in qubit spacing and scalability.

Purpose of the Study:

  • To propose a mechanism for long-range coherent coupling between nuclear spin qubits.
  • To enable scalable quantum information processing in semiconductor heterojunctions.
  • To maintain control and measurement fidelity with increased qubit separation.

Main Methods:

  • Derivation of an effective interaction Hamiltonian for localized donor electrons.
  • Evaluation of coupling strength mediated by a two-dimensional electron gas.

Related Experiment Videos

  • Analysis of decoherence mechanisms and gate control strategies.

    • Main Results:

    • A mechanism for long-range coherent coupling (approx. 100 nm) between nuclear spin qubits is proposed.
    • The interaction Hamiltonian and coupling strength are theoretically evaluated.
    • The scheme is compatible with existing semiconductor device technologies.

    Conclusions:

    • The proposed mechanism facilitates scalable quantum computing architectures.
    • It overcomes limitations of shorter-range qubit interactions.
    • This advancement supports the development of practical quantum information processors.