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Optical RKKY interaction between charged semiconductor quantum dots.

C Piermarocchi1, Pochung Chen, L J Sham

  • 1Department of Physics, University of California San Diego, La Jolla 92093-0319, USA.

Physical Review Letters
|October 26, 2002
PubMed
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We demonstrate optical control of electron spin interactions in quantum dots. This method uses virtual excitons for efficient, robust quantum manipulation, enabling quantum computing applications.

Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Optics

Background:

  • Electron spins in quantum dots are crucial for quantum information processing.
  • Controlling these spins optically offers a promising avenue for scalable quantum technologies.

Purpose of the Study:

  • To demonstrate optical induction and control of spin interactions between electrons in adjacent quantum dots.
  • To explore the potential of this technique for quantum computation and magnetism control.

Main Methods:

  • Utilizing virtual excitation of delocalized excitons to mediate spin coupling.
  • Employing adiabatic passage techniques for coherent spin manipulation.

Main Results:

  • Achieved efficient and coherent control over electron spin interactions.

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  • Demonstrated robustness against decoherence from spontaneous emission.

    • Conclusions:

    • Optical control of quantum dot spins is feasible and robust.
    • This technique has significant applications in quantum computing, quantum gates, and spintronics.