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Phase matching as a gate for photon entanglement.

A M Zheltikov1,2,3,4

  • 1Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119992, Russia.

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|July 14, 2017
PubMed
Summary

Phase matching creates tunable gates to distinguish entangled photons from noise in fiber optics. This method enhances entangled photon output by suppressing Raman scattering, improving quantum communication applications.

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Area of Science:

  • Quantum optics
  • Nonlinear fiber optics

Background:

  • Four-wave mixing (FWM) in optical fibers generates entangled photon pairs.
  • Raman scattering produces uncorrelated photons, posing a challenge for quantum applications.
  • Distinguishing entangled photons from noise is crucial for quantum information processing.

Purpose of the Study:

  • To demonstrate phase matching as a tunable gate for discriminating entangled photons from Raman noise.
  • To explore two distinct types of phase-matching gates for enhanced photon-entanglement fidelity.

Main Methods:

  • Utilizing phase matching in the normal dispersion regime with high-order dispersion management.
  • Employing dual-pump cross-phase-modulation-induced FWM sideband generation.
  • Tuning gates via dispersion management and pump group-velocity mismatch.

Main Results:

  • Phase-matching gates effectively discriminate entangled photons from Raman scattering.
  • First type of gate, in normal dispersion, allows wide tuning of FWM sidebands via dispersion management.
  • Second type of gate, using dual-pump FWM, is tunable by pump group-velocity mismatch.

Conclusions:

  • Phase matching offers a robust method for enhancing the signal-to-noise ratio in fiber-based entangled photon generation.
  • The developed gates are critical for advancing quantum communication and computation technologies.
  • Tunable phase-matching gates significantly improve the purity of entangled states for practical applications.