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Quantum correlation among photons from a single quantum dot at room temperature

Michler1, Imamoglu, Mason

  • 1Department of Electrical and Computer Engineering, University of California, Santa Barbara 93106, USA.

Nature
|September 13, 2000
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Researchers observed photon antibunching from a single quantum dot, demonstrating it as a solid-state source of non-classical light. This artificial system behaves like a single atom, unlike clusters of quantum dots.

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Area of Science:

  • Quantum optics
  • Solid-state physics
  • Materials science

Background:

  • Classical electromagnetism (Maxwell's equations) describes statistical fluorescence but not correlations from single emitters.
  • Quantization of the radiation field is necessary for understanding single quantum emitter light correlations.
  • Photon antibunching in atomic resonance fluorescence confirms non-classical radiation.

Purpose of the Study:

  • To experimentally observe photon antibunching from a single quantum dot at room temperature.
  • To establish quantum dots as artificial atoms and solid-state sources of non-classical light.
  • To investigate the photon emission statistics from single quantum dots versus clusters.

Main Methods:

  • Experimental observation of photon emission.
  • Measurement of photon correlations (antibunching).
  • Utilizing a single cadmium selenide quantum dot at room temperature.

Main Results:

  • Photon antibunching was observed from a single cadmium selenide quantum dot.
  • Single quantum dots exhibit discrete anharmonic spectra, behaving like artificial atoms.
  • Photon emission from clusters of quantum dots showed uncorrelated events.

Conclusions:

  • Single quantum dots serve as solid-state sources of non-classical light.
  • Quantum dots mimic the behavior of single atoms in terms of photon emission.
  • The anharmonic spectrum of single quantum dots is crucial for non-classical light generation.