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High-yield single-photon source using gated spontaneous parametric downconversion.

Shigeki Takeuchi1, Ryo Okamoto, Keiji Sasaki

  • 1Research Institute for Electronic Science, Hokkaido University, Kita-ku, Sapporo, Hokkaido 060-0812, Japan. takeuchi@es.hokudai.ac.jp

Applied Optics
|November 13, 2004
PubMed
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Researchers developed a single-photon source using gated parametric fluorescence. This method achieved a 26.5% probability of emitting a single photon, crucial for quantum technologies.

Area of Science:

  • Quantum optics
  • Photonics
  • Quantum information science

Background:

  • Single-photon sources are fundamental for quantum technologies like quantum computing and cryptography.
  • Parametric fluorescence is a common method for generating entangled photon pairs.
  • Achieving high collection efficiency and high single-photon probability is a key challenge.

Purpose of the Study:

  • To construct and characterize a novel single-photon source.
  • To investigate the use of gated parametric fluorescence for improved photon generation.
  • To measure the photon number distribution and assess the source's performance.

Main Methods:

  • Utilized gated parametric fluorescence for photon generation.
  • Employed a beamlike twin-photon method to enhance collection efficiency.

Related Experiment Videos

  • Measured the photon number distribution to determine single-photon probability.

    • Main Results:

    • Successfully constructed a single-photon source.
    • Achieved a high-collection efficiency using the twin-photon method.
    • Estimated the probability P(1) of detecting a single photon in a collimated pulse to be 26.5% at a 10 kHz repetition rate, after compensating for a 27.4% effective quantum efficiency.

    Conclusions:

    • The developed single-photon source demonstrates promising performance for quantum applications.
    • Gated parametric fluorescence combined with a beamlike twin-photon method is effective for generating single photons with high efficiency.
    • Further improvements in detection efficiency could significantly enhance the single-photon output probability.