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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Dynamics of nonclassical light from a single solid-state quantum emitter.

Edward B Flagg1, Sergey V Polyakov, Tim Thomay

  • 1Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, Gaithersburg, Maryland 20899, USA. edward.flagg@nist.gov

Physical Review Letters
|December 11, 2012
PubMed
Summary
This summary is machine-generated.

We measured single-photon purity and coherence dynamics in quantum dots using two-time correlations. Early photons showed lower purity due to exciton recapture, unlike later ones.

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Area of Science:

  • Quantum optics
  • Solid-state physics
  • Materials science

Background:

  • Nonclassical optical fields are crucial for quantum technologies.
  • Understanding emitter dynamics, like single-photon purity and coherence, is essential for device performance.
  • Quantum dots are promising solid-state emitters for quantum applications.

Purpose of the Study:

  • To measure the dynamics of single-photon purity and coherence in a quantum emitter.
  • To investigate the influence of excitation-decay cycles on nonclassical optical field properties.
  • To elucidate the underlying physical mechanisms affecting these dynamics.

Main Methods:

  • Utilized two-time second-order correlation measurements.
  • Employed pulsed excitation to probe emitter dynamics.
  • Analyzed the excitation-decay cycle of a quantum dot emitter.

Main Results:

  • Quantified single-photon purity and coherence throughout the excitation-decay cycle.
  • Observed reduced single-photon purity and coherence for photons detected early in the cycle at specific pump wavelengths.
  • Detected higher purity and coherence for photons emitted later in the cycle.

Conclusions:

  • Single-photon purity and coherence are not static but evolve dynamically during the emitter's cycle.
  • Exciton recapture after initial emission within the same pulse cycle was identified as the mechanism for reduced early-photon purity.
  • The findings provide insights into controlling and optimizing quantum emitters for quantum information applications.