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Related Experiment Video

Updated: Sep 1, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Postselected Entanglement between Two Atomic Ensembles Separated by 12.5 km.

Xi-Yu Luo1,2,3, Yong Yu1,2,3, Jian-Long Liu1,2,3

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

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|August 12, 2022
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Summary

Researchers established entanglement between two atomic quantum memories separated by 12.5 km. This breakthrough advances the development of practical, metropolitan-scale quantum networks by demonstrating reliable quantum memory entanglement over long distances.

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Area of Science:

  • Quantum Information Science
  • Quantum Networking
  • Atomic Physics

Background:

  • Quantum internet promises to connect quantum resources for advanced applications.
  • A key prototype involves entangled, spatially separated quantum memories.
  • Establishing entanglement over distance is crucial for quantum network realization.

Purpose of the Study:

  • To demonstrate entanglement between two physically separated atomic quantum memories.
  • To investigate the feasibility of a metropolitan-scale quantum network.

Main Methods:

  • Created atom-photon entanglement in one node.
  • Transmitted photons over a 20.5 km deployed fiber using frequency conversion.
  • Stored photons in a second atomic quantum memory via electromagnetically induced transparency.
  • Verified memory-memory entanglement through photon retrieval.

Main Results:

  • Achieved postselected entanglement between atomic quantum memories separated by 12.5 km.
  • Demonstrated high-fidelity entanglement (90%) verified via photon retrieval.
  • Utilized low-loss fiber transmission with frequency up- and down-conversion.

Conclusions:

  • This experiment represents a significant advancement towards practical quantum networks.
  • The successful entanglement over 12.5 km paves the way for metropolitan-scale quantum communication.
  • The methods employed are crucial for overcoming distance limitations in quantum networking.