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Near-Transform-Limited Single Photons from an Efficient Solid-State Quantum Emitter.

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Researchers generated 1000 indistinguishable single photons using quantum dots. Photon interference visibility remained high over microseconds, suitable for quantum experiments.

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Area of Science:

  • Quantum Optics
  • Solid-State Physics

Background:

  • Single photons are crucial for quantum information processing.
  • Generating indistinguishable photons is a key challenge.

Purpose of the Study:

  • To generate long streams of high-quality single photons.
  • To assess photon indistinguishability over extended timescales.

Main Methods:

  • Pulsed s-shell resonant excitation of a single quantum dot-micropillar system.
  • Hong-Ou-Mandel interference measurements.
  • Temporal and spectral analysis of emitted photons.

Main Results:

  • Generation of 1000 near-transform-limited single photons with high mutual indistinguishability (95.9%).
  • Visibility maintained a plateau of 92.1% for time separations up to 14.7 μs.
  • Identified a slow dephasing process with a 0.7 μs timescale.

Conclusions:

  • Pulsed resonance fluorescence enables high-quality single photon generation.
  • Photons are suitable for multiphoton entanglement and interferometry.
  • Demonstrated long-term coherence of single photons from quantum dots.