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Area of Science:

  • Quantum Optics
  • Nonlinear Optics
  • Integrated Photonics

Background:

  • Photon pair generation is crucial for quantum information processing.
  • Existing methods often face limitations in spectral bandwidth and mode density.
  • Cavity-enhanced nonlinear optical processes offer potential for improved photon pair generation.

Purpose of the Study:

  • To demonstrate a frequency-multiplexed photon pair generator.
  • To achieve high-density photon pair generation over a broad spectral range.
  • To overcome limitations of conventional resonant photon pair generation.

Main Methods:

  • Utilizing a quadratic nonlinear optical waveguide within a cavity.
  • Monolithic construction with a periodically poled lithium niobate (PPLN) waveguide.
  • Employing wavelength-selective coatings (high-reflective for signal, anti-reflective for idler and pump).

Main Results:

  • Observed comblike photon pair generation with cavity free spectral range mode spacing.
  • Achieved incessant photon pair generation over an 80 nm bandwidth.
  • Generated over 1000-mode frequency-multiplexed photon pairs without missing modes.

Conclusions:

  • The demonstrated device enables efficient, broadband, frequency-multiplexed photon pair generation.
  • This approach overcomes spectral limitations of conventional resonant methods.
  • The PPLN waveguide cavity offers a promising platform for scalable quantum light sources.