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Electrically Pumped Ultrabright Entangled Photons on Chip.

Xu-Feng Jiao1,2,3, Ming-Yang Zheng2,3, Yi-Hang Chen4,5

  • 1University of Science and Technology of China, Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, Hefei, Anhui 230026, China.

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|January 20, 2026
PubMed
Summary
This summary is machine-generated.

We developed a new, compact chip-scale entangled photon source (EPS) that is electrically pumped and requires no post-selection. This high-performance quantum technology achieves a high generation rate, paving the way for advanced quantum communication and metrology.

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Area of Science:

  • Quantum Information Science
  • Integrated Photonics
  • Quantum Optics

Background:

  • Entangled photon sources (EPSs) are fundamental to quantum technologies.
  • Existing integrated EPSs face challenges in scalability and performance.
  • Thin-film lithium niobate platforms offer potential for advanced photonic devices.

Purpose of the Study:

  • To demonstrate a scalable, high-performance, chip-scale entangled photon source.
  • To achieve an electrically pumped, post-selection-free polarization EPS.
  • To enable practical quantum applications through integrated photonics.

Main Methods:

  • Hybrid integration of a distributed feedback laser with a thin-film lithium niobate chip.
  • Incorporation of periodically poled lithium niobate waveguides, a beam splitter, and a polarization rotator combiner.
  • Electrical pumping of the integrated chip for photon generation.

Main Results:

  • Demonstration of an electrically pumped, post-selection-free polarization EPS.
  • Achieved a bandwidth of 73 nm and an entanglement pair generation rate of 4.5×10^10 pairs/s/mW.
  • Bell-state fidelities exceeding 96% across frequency-correlated modes.

Conclusions:

  • The developed compact, integrated EPS offers high performance and scalability.
  • This technology is suitable for applications like high-speed quantum key distribution and satellite quantum communication.
  • The device advances entanglement-based quantum metrology and other quantum applications.