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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Non-degenerated sequential time-bin entanglement generation using periodically poled KTP waveguide.

Lijun Ma1, Oliver Slattery, Tiejun Chang

  • 1Information Technology Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA. lijun.ma@nist.gov

Optics Express
|September 3, 2009
PubMed
Summary

Researchers developed a novel entangled photon-pair source for quantum communication. This source emits photons at wavelengths suitable for both local and long-distance applications, demonstrating high fringe visibility.

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Area of Science:

  • Quantum optics and photonics
  • Quantum information science

Background:

  • Entangled photon-pair sources are fundamental for quantum communication and computation.
  • Previous sources often had limitations in wavelength suitability or flux rates.

Purpose of the Study:

  • To experimentally implement a non-degenerate sequential time-bin entangled photon-pair source.
  • To achieve wavelengths suitable for both local (895 nm) and long-distance (1310 nm) optical communications.
  • To assess the source's performance for quantum memory applications.

Main Methods:

  • Utilized a periodically poled potassium titanyl phosphate (PPKTP) waveguide.
  • Operated the source at a clock rate of 1 GHz.
  • Employed a silicon avalanche photodiode for 895 nm photon detection and a periodically poled lithium niobate (PPLN) waveguide up-conversion detector for 1310 nm photon detection.

Main Results:

  • Achieved a measured entangled-photon-pair flux rate of 650 Hz.
  • Demonstrated a fringe visibility of 79.4% for two-photon interference without noise subtraction.
  • The source produces photons at 895 nm and 1310 nm, ideal for different communication ranges and quantum memory research.

Conclusions:

  • Successfully implemented a versatile entangled photon-pair source.
  • The source's dual-wavelength output and performance metrics are promising for advancing quantum communication technologies.
  • The demonstrated capabilities support applications in secure communication and quantum networking.