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Related Experiment Videos

Optically programmable electron spin memory using semiconductor quantum dots.

Miro Kroutvar1, Yann Ducommun, Dominik Heiss

  • 1Walter Schottky Institut, Technische Universität München, Am Coulombwall 3, D-85748 Garching, Germany.

Nature
|November 5, 2004
PubMed
Summary

Single electron spins in semiconductor quantum dots show long lifetimes, making them promising for quantum computing. This study demonstrates a spin memory device with optical programming and measures spin flip times.

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Area of Science:

  • Quantum Computing
  • Spintronics
  • Semiconductor Physics

Background:

  • Single electron spins in static magnetic fields serve as natural two-level systems for quantum bits.
  • Semiconductor quantum dots offer controllable positioning and integration into devices for spin quantum bits.
  • Predicted atomic-like electronic structures in quantum dots suppress environmental coupling, protecting quantum information.

Purpose of the Study:

  • To demonstrate a single electron spin memory device utilizing semiconductor quantum dots.
  • To program electron spins using frequency-selective optical excitation.
  • To directly measure intrinsic spin flip time and its magnetic field dependence.

Main Methods:

  • Fabrication of semiconductor quantum dots via strain-driven self-assembly.

Related Experiment Videos

  • Programming of single electron spins using frequency-selective optical excitation.
  • Direct measurement of spin flip time and magnetic field dependence at 1 Kelvin and 4 Tesla.

    • Main Results:

    • Successful demonstration of a single electron spin memory device.
    • Preparation of single electron spins in semiconductor quantum dots with defined orientation.
    • Obtained a very long spin lifetime, with a lower limit of approximately 20 milliseconds at 4 Tesla and 1 Kelvin.

    Conclusions:

    • Semiconductor quantum dots are suitable for realizing robust spin quantum bits.
    • The demonstrated device enables optical programming and direct measurement of spin properties.
    • Achieved long spin lifetimes indicate potential for quantum information storage and processing.