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Entangled photons from on-chip slow light.

Hiroki Takesue1, Nobuyuki Matsuda2, Eiichi Kuramochi2

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Researchers created high-dimensional entangled photon pairs using an on-chip slow light device. This breakthrough enables compact quantum information processing sources with potential for integrated quantum photonics applications.

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Area of Science:

  • Quantum Photonics
  • Integrated Quantum Optics
  • Silicon Photonics

Background:

  • Entanglement generation is crucial for quantum information processing.
  • On-chip photonic devices offer miniaturization and scalability for quantum technologies.
  • Slow light effects can enhance nonlinear optical processes.

Purpose of the Study:

  • To demonstrate the first entanglement generation using an on-chip slow light device.
  • To generate high-dimensional time-bin entangled photon pairs.
  • To assess the feasibility of integrated on-chip entanglement sources.

Main Methods:

  • Utilized a silicon photonic crystal coupled resonator optical waveguide.
  • Employed spontaneous four-wave mixing enhanced by the slow light effect.
  • Conducted two-photon interference experiments to verify entanglement.

Main Results:

  • Successfully generated 1.5-μm-band high-dimensional time-bin entangled photon pairs.
  • Observed coincidence fringes with visibilities exceeding 74% in interference experiments.
  • Demonstrated the effectiveness of slow light in enhancing entanglement generation.

Conclusions:

  • The study presents a novel on-chip entanglement source with a significantly small footprint.
  • This technology is essential for advancing integrated quantum photonics and quantum information processing.
  • The results pave the way for scalable and practical quantum devices.