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All-photonic quantum repeaters.

Koji Azuma1, Kiyoshi Tamaki1, Hoi-Kwong Lo2

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This summary is machine-generated.

This study introduces all-photonic quantum repeaters, eliminating the need for matter quantum memories. This breakthrough enhances quantum communication efficiency over long distances using flying qubits and single-photon sources.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication Technologies
  • Photonic Quantum Systems

Background:

  • Quantum communication offers secure message transmission and quantum state transfer.
  • Photons are the preferred medium for quantum communication.
  • Photon losses in channels necessitate quantum repeaters for robust long-distance communication.

Purpose of the Study:

  • To challenge the necessity of matter quantum memories for quantum repeaters.
  • To introduce and demonstrate the viability of all-photonic quantum repeaters.
  • To improve the efficiency and scalability of quantum communication.

Main Methods:

  • Development of all-photonic quantum repeaters utilizing flying qubits.
  • Implementation of a protocol with photonic cluster-state machine guns.
  • Utilizing loss-tolerant measurement with local high-speed active feedforwards.

Main Results:

  • Demonstrated that matter quantum memories are not essential for quantum repeaters.
  • Achieved polynomial scaling of communication efficiency with channel distance.
  • Showcased a new route for quantum repeaters using single-photon sources.

Conclusions:

  • All-photonic quantum repeaters offer a viable alternative to those requiring matter quantum memories.
  • This approach significantly enhances the efficiency of long-distance quantum communication.
  • The findings pave the way for practical quantum repeaters based on efficient single-photon sources.