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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Parametric down-conversion and polariton pair generation in optomechanical systems.

Yong-Chun Liu1, Yun-Feng Xiao, You-Ling Chen

  • 1Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, People's Republic of China.

Physical Review Letters
|September 10, 2013
PubMed
Summary

This study shows nonlinear optomechanical interactions can generate photon-phonon polariton pairs via parametric down-conversion. This method offers selective control over polariton types without strict coupling conditions.

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Area of Science:

  • Quantum Optics
  • Optomechanics
  • Condensed Matter Physics

Background:

  • Optomechanical systems couple light and mechanical motion.
  • Nonlinear interactions are crucial for advanced quantum phenomena.
  • Parametric down-conversion typically requires strong single-photon coupling.

Purpose of the Study:

  • To demonstrate parametric down-conversion of polaritons using nonlinear optomechanical interactions.
  • To explore selective generation of different polariton types (photonlike, phononlike, mixed).
  • To investigate nonlinear optomechanics without stringent single-photon coupling requirements.

Main Methods:

  • Theoretical analysis of frequency matching conditions for parametric down-conversion.
  • Derivation of the nonlinear coefficient for the system.
  • Numerical simulations of polariton pair generation.

Main Results:

  • Nonlinear optomechanical interaction enables parametric down-conversion.
  • Frequency matching resonantly enhances nonlinearity.
  • Selective generation of photonlike, phononlike, and mixed polaritons is achieved.
  • The method bypasses the need for strong single-photon optomechanical coupling.

Conclusions:

  • Nonlinear optomechanics provides a viable route for generating and controlling polariton pairs.
  • This approach offers a new tool for manipulating photons and phonons.
  • The findings advance the understanding of light-matter interactions in hybrid quantum systems.