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Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light
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Drop-in compatible entanglement for optical-fiber networks.

Matthew A Hall1, Joseph B Altepeter, Prem Kumar

  • 1Center for Photonic Communication and Computing, Department of Electrical Engineering and Computer Science, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3118, USA. m-hall1@northwestern.edu

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We developed a practical source for entangled photons using standard optical fiber, achieving high fidelity for quantum communication. This fiber-based source is compatible with existing telecommunications infrastructure.

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Area of Science:

  • Quantum optics
  • Quantum communication
  • Photonics

Background:

  • Quantum communication protocols increasingly rely on distributing entanglement between remote locations.
  • Low-loss optical fiber networks offer a mature infrastructure for entanglement distribution.
  • A practical source of entangled photons must be compatible with existing fiber optic networks.

Purpose of the Study:

  • To demonstrate a practical, fiber-compatible source of entangled photons.
  • To utilize the nonlinearity of standard single-mode fiber for generating entangled photon pairs.
  • To ensure the source's compatibility with telecommunications infrastructure, including optical amplifiers.

Main Methods:

  • Utilized the nonlinearity of standard single-mode fiber to generate entangled photon pairs in the 1310-nm O-band.
  • Employed an ultra-stable design to produce polarization entanglement.
  • Characterized entanglement fidelity using coincidence-basis tomography.
  • Tested drop-in compatibility by transmitting photons through a telecommunications-grade optical amplifier operating in the 1550-nm C-band.

Main Results:

  • Achieved polarization entanglement with 98.0% +/- 0.5% fidelity to a maximally entangled state.
  • Demonstrated no measurable decoherence after transmission through an active optical amplifier.
  • Maintained high output state fidelity (98.4% +/- 1.4%) after amplification.

Conclusions:

  • Successfully demonstrated the first fiber-optic-compatible source for entangled photons.
  • The developed source is suitable for integration into existing fiber optic networks for quantum communication.
  • The source's performance is robust, even when subjected to amplification within telecommunications systems.