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Integrated Source of Path-Entangled Photon Pairs with Efficient Pump Self-Rejection.

Pablo de la Hoz1, Anton Sakovich2, Alexander Mikhalychev2

  • 1School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK.

Nanomaterials (Basel, Switzerland)
|October 3, 2020
PubMed
Summary

We propose a novel integrated source for generating entangled photon pairs using four-wave mixing. This method achieves high pump light rejection, simplifying future quantum optics experiments.

Keywords:
coherent diffusive photonicsentangled photons generationfour-wave mixing

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Area of Science:

  • Quantum optics
  • Nonlinear photonics
  • Integrated photonics

Background:

  • Generating entangled photon pairs is crucial for quantum information processing.
  • Existing methods often struggle with efficient pump light suppression, complicating experiments.
  • Integrated photonic platforms offer miniaturization and scalability for quantum technologies.

Purpose of the Study:

  • To theoretically propose an integrated source for narrow-band, path-entangled photon pairs.
  • To achieve efficient spatial pump self-rejection without external filtering.
  • To explore the generation of two-photon NOON states with similar pump rejection.

Main Methods:

  • Utilizing correlated loss in a waveguide system within Kerr nonlinear media.
  • Engineering dissipation to attenuate a symmetric collective mode.
  • Leveraging the antisymmetric mode for photon pair generation.

Main Results:

  • Calculated pump rejection exceeding 100 dB.
  • Demonstrated feasibility in various waveguide materials including fused silica, IG2, indium phosphide (InP), and silicon.
  • Proposed a method for generating two-photon NOON states with intrinsic pump suppression.

Conclusions:

  • The proposed scheme offers a robust method for generating high-quality entangled photons.
  • Efficient pump rejection simplifies experimental setups and enhances signal-to-noise ratios.
  • The approach is compatible with established integrated photonic fabrication techniques.