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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Indistinguishable photons from a single-photon device.

Charles Santori1, David Fattal, Jelena Vucković

  • 1Quantum Entanglement Project, ICORP, JST, E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305-4088, USA. chars@stanford.edu

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|October 11, 2002
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Summary
This summary is machine-generated.

Semiconductor quantum dots in microcavities can generate indistinguishable single photons. This breakthrough is crucial for advancing quantum information technologies and quantum optics experiments.

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Area of Science:

  • Quantum Optics
  • Quantum Information Science
  • Semiconductor Physics

Background:

  • Single-photon sources are essential for quantum information processing.
  • Existing sources often struggle with photon indistinguishability, limiting applications like linear-optical quantum computation.
  • Semiconductor quantum dots offer a promising platform for deterministic single-photon generation.

Purpose of the Study:

  • To investigate the indistinguishability of photons emitted by a semiconductor quantum dot in a microcavity.
  • To assess the suitability of these sources for quantum information applications requiring identical photon wave packets.

Main Methods:

  • Utilized a semiconductor quantum dot embedded within a microcavity structure.
  • Performed a Hong-Ou-Mandel-type two-photon interference experiment to measure photon indistinguishability.
  • Quantified the wave-packet overlap between consecutively emitted photons.

Main Results:

  • Demonstrated largely indistinguishable photons from the semiconductor quantum dot source.
  • Achieved a high mean wave-packet overlap of 0.81.
  • Confirmed that the source rarely emits multiple photons in the same pulse, unlike Poissonian sources.

Conclusions:

  • Semiconductor quantum dots in microcavities provide a viable source of indistinguishable single photons.
  • The high degree of indistinguishability makes this source highly valuable for quantum optics and quantum information applications.
  • This work advances the development of robust single-photon sources for future quantum technologies.