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Long lived coherence in self-assembled quantum dots.

D Birkedal1, K Leosson, J M Hvam

  • 1Research Center COM, Technical University of Denmark, DK-2800 Kogens Lyngby, Denmark. Birkedal@com.dtu.dk

Physical Review Letters
|December 12, 2001
PubMed
Summary

We measured ultralong coherence in quantum dots, finding a long dephasing time of 372 ps. This indicates pure dephasing at higher temperatures, with lifetime-limited width only near absolute zero.

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Area of Science:

  • Quantum physics
  • Solid-state physics
  • Materials science

Background:

  • Quantum dots are semiconductor nanocrystals with tunable optical and electronic properties.
  • Understanding coherence is crucial for quantum information processing and quantum computing applications.
  • Self-assembled quantum dots offer a promising platform for scalable quantum technologies.

Purpose of the Study:

  • To measure and analyze the coherence properties of self-assembled quantum dots.
  • To investigate the temperature dependence of coherence and dephasing mechanisms.
  • To determine the homogeneous linewidth and its relation to the excited-state lifetime.

Main Methods:

  • Transient four-wave mixing experiments were performed at 5 K.
  • Time-resolved luminescence measurements were used to determine ground-state lifetimes.

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  • Optical spectroscopy techniques were employed to probe coherence dynamics.

    • Main Results:

    • An average dephasing time of 372 picoseconds was measured.
    • A homogeneous linewidth of 3.5 microeV was determined, significantly narrower than observed in single-dot luminescence.
    • A ground-state lifetime of 800 picoseconds was found, indicating pure dephasing at finite temperatures.

    Conclusions:

    • Ultralong coherence is achievable in self-assembled quantum dots.
    • Pure dephasing contributes to the homogeneous linewidth at finite temperatures.
    • The homogeneous linewidth is lifetime-limited only at temperatures approaching absolute zero (0 K).