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Dario Lago-Rivera1, Samuele Grandi1, Jelena V Rakonjac1

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Researchers demonstrated heralded entanglement between two quantum nodes using praseodymium-doped crystals. This breakthrough enables robust, long-duration entanglement storage for future quantum networks and quantum repeaters.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication
  • Solid-State Quantum Systems

Background:

  • Future quantum networks require entanglement distribution between remote nodes for applications in communication, sensing, and computation.
  • Existing entanglement methods lack compatibility with telecommunication wavelengths and multimode operation essential for network functionality.

Purpose of the Study:

  • To demonstrate heralded entanglement between spatially separated quantum nodes using solid-state quantum memories.
  • To achieve entanglement storage compatible with telecommunication wavelengths and capable of multimode operation.

Main Methods:

  • Utilized praseodymium-doped crystals at each quantum node to store photons from correlated pairs.
  • Heralded entanglement by detecting telecom-wavelength photons, achieving rates up to 1.4 kHz.
  • Demonstrated entanglement storage for up to 25 microseconds and temporally multiplexed operation with 62 modes.

Main Results:

  • Successfully generated heralded entanglement between two quantum memories in separate laboratories.
  • Entanglement storage demonstrated robustness against loss in the heralding channel.
  • Achieved temporally multiplexed operation, showcasing the potential for high-capacity quantum repeaters.

Conclusions:

  • The developed system provides a viable route towards field-deployed, multiplexed quantum repeaters based on solid-state resources.
  • This work is extendable to entanglement distribution over longer distances, crucial for scaling quantum networks.