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Researchers developed a novel optical relay for drones to distribute entangled photons over 1 km. This breakthrough advances mobile quantum networks by enabling low-loss free-space transmission of quantum information.

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Area of Science:

  • Quantum Information Science
  • Free-Space Optics
  • Quantum Communication Networks

Background:

  • Entanglement distribution is crucial for quantum networks.
  • Mobile platforms like drones offer flexibility for quantum communication.
  • Free-space transmission of photons faces challenges like diffraction loss.

Purpose of the Study:

  • To develop an optical relay system for airborne entanglement distribution.
  • To enable low-diffraction loss free-space transmission of entangled photons.
  • To establish a scalable airborne system for mobile quantum networks.

Main Methods:

  • Designed and implemented a novel optical relay to reshape photon wavefronts.
  • Utilized two drones: one as an entangled photon source, the other as a relay node.
  • Achieved precise tracking and alignment between mobile platforms.

Main Results:

  • Demonstrated entanglement distribution between two drones over a 1 km distance.
  • Measured a Clauser-Horne-Shimony-Holt S parameter of 2.59±0.11, confirming entanglement.
  • Developed lightweight, high-performance components for the airborne quantum system.

Conclusions:

  • The developed optical relay enables efficient free-space entanglement distribution from mobile platforms.
  • This technology paves the way for scalable, multinode mobile quantum networks.
  • The system represents a significant step towards practical airborne quantum communication.