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Related Experiment Videos

Electron spin decoherence in quantum dots due to interaction with nuclei.

Alexander V Khaetskii1, Daniel Loss, Leonid Glazman

  • 1Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.

Physical Review Letters
|May 15, 2002
PubMed
Summary

We investigated electron spin decoherence in quantum dots due to nuclear interactions. Unlike exponential decay, we found a power-law decay, tunable with magnetic fields, differing significantly from ensemble dephasing.

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Area of Science:

  • Quantum physics
  • Condensed matter physics

Background:

  • Electron spin decoherence in quantum dots is crucial for quantum computing.
  • Hyperfine interaction with nuclei is a primary decoherence mechanism.

Purpose of the Study:

  • To analyze the decoherence dynamics of a single electron spin in an isolated quantum dot.
  • To understand the impact of non-uniform hyperfine coupling on spin decay.

Main Methods:

  • Evaluation of the spin correlation function.
  • Analytical solution for polarized nuclei.

Main Results:

  • Decoherence follows a power-law (inverse logarithm) decay, not exponential.
  • Decay time depends on the number of nuclei (N) and coupling strength (A).

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  • Precession amplitude decays to a finite value and is tunable by magnetic field.

    • Conclusions:

    • The study reveals a distinct decoherence mechanism for single quantum dots compared to ensembles.
    • Findings offer insights into controlling quantum dot spin coherence for quantum technologies.