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Related Experiment Videos

Exchange in silicon-based quantum computer architecture.

Belita Koiller1, Xuedong Hu, S Das Sarma

  • 1Department of Physics, University of Maryland, College Park, Maryland 20742-4111 and Instituto de Física, Universidade Federal do Rio de Janeiro, 21945 Rio de Janeiro, Brazil.

Physical Review Letters
|January 22, 2002
PubMed
Summary
This summary is machine-generated.

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Precise donor atom placement is crucial for silicon quantum computing. Intervalley interference in silicon and germanium causes oscillations affecting two-qubit operations.

Area of Science:

  • Quantum computing
  • Condensed matter physics
  • Materials science

Background:

  • Silicon-based quantum computing is a promising area of research.
  • Donor electron exchange is fundamental for qubit operations.

Purpose of the Study:

  • To investigate donor electron exchange in silicon and germanium.
  • To identify atomic-scale challenges for quantum computing in these materials.

Main Methods:

  • Calculation of donor electron exchange in silicon and germanium.
  • Analysis of intervalley electronic interference effects.

Main Results:

  • Six (four) conduction-band minima in Si (Ge) cause intervalley interference.
  • Strong oscillations observed in the exchange splitting of two-donor two-electron states.

Related Experiment Videos

  • Atomic-scale donor positioning critically impacts exchange coupling strength.

    • Conclusions:

    • Precise atomic-scale donor positioning is essential for controlling exchange coupling.
    • Intervalley interference presents a significant challenge for silicon quantum computing.
    • This work highlights a key factor for developing robust two-qubit operations in silicon quantum computers.