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Chip-integrated visible-telecom photon pair sources for quantum communication.

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We developed a novel on-chip source generating visible-telecom photon pairs, crucial for quantum communication. This breakthrough enables connecting quantum systems across different spectral bands for future quantum networks.

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Area of Science:

  • Quantum optics
  • Integrated photonics
  • Quantum communication

Background:

  • Photon pair sources are essential for quantum entanglement and communication.
  • Existing silicon photonics sources operate in the telecom band, limiting integration with visible-light quantum systems.
  • High optical attenuation in silica fibers at visible wavelengths restricts communication distances.

Purpose of the Study:

  • To develop an on-chip photon pair source bridging the visible and telecom bands.
  • To achieve narrow-band photon pair generation with a high signal-to-noise ratio.
  • To enable fiber-based quantum communication between disparate quantum systems.

Main Methods:

  • Utilized high quality factor silicon nitride microresonators for on-chip photon pair generation.
  • Employed dispersion engineering of microresonators.
  • Generated bright photon pairs with high spectral brightness and purity.

Main Results:

  • Demonstrated the first on-chip visible-telecom photon pair source.
  • Achieved an unprecedented coincidence-to-accidental ratio (CAR) up to (3.8 ± 0.2) × 10^3.
  • Engineered microresonators to connect visible/NIR quantum systems to telecom bands.

Conclusions:

  • The developed source overcomes spectral mismatch limitations in quantum communication.
  • Enables fiber-based quantum communication between trapped atoms/ions, defect centers, and quantum dots.
  • Paves the way for scalable quantum networks and distributed quantum computing.