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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

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Published on: May 30, 2014

Broadband frequency mode entanglement in waveguided parametric downconversion.

Andreas Eckstein1, Christine Silberhorn

  • 1Max Planck Research Group, Erlangen, Germany. aeckstein@optik.uni-erlangen.de

Optics Letters
|August 19, 2008
PubMed
Summary
This summary is machine-generated.

We observed rhythmic fluctuations in photon coincidence rates during Hong-Ou-Mandel interference experiments. This phenomenon is explained by biphotonic states entangled in broadband frequency modes from parametric downconversion.

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Area of Science:

  • Quantum optics
  • Photonics
  • Nonlinear optics

Background:

  • The Hong-Ou-Mandel interference (HOMI) is a fundamental quantum optical experiment demonstrating the indistinguishability of photons.
  • Parametric downconversion (PDC) is a key process for generating entangled photon pairs.
  • Waveguide-based PDC offers enhanced control over photon properties.

Purpose of the Study:

  • To report and explain the observation of "beatings" in the coincidence event rate during HOMI.
  • To introduce a theoretical model for biphotonic states generated in multimode waveguides.
  • To propose a method for detecting the predicted quantum entanglement.

Main Methods:

  • Experimental setup utilizing a multimode Potassium Titanyl Phosphate (KTP) waveguide for PDC.
  • Observation of coincidence event rates between signal and idler photons.
  • Theoretical modeling of biphotonic states entangled in frequency modes.

Main Results:

  • Observed distinct beatings in the HOMI coincidence rate.
  • Attributed these beatings to the interference of biphotonic states generated via waveguide mode triples.
  • Proposed an entanglement detection scheme based on the observed beatings.

Conclusions:

  • The observed beatings provide evidence for frequency-entangled biphotonic states in multimode waveguides.
  • Waveguide mode structure plays a crucial role in generating complex entangled states.
  • The proposed scheme offers a pathway for verifying quantum entanglement in such systems.