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Resource-efficient fault-tolerant one-way quantum repeater with code concatenation.

Kah Jen Wo1,2, Guus Avis1,3,4,5, Filip Rozpędek5,6

  • 1QuTech, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.

NPJ Quantum Information
|April 26, 2024
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Summary
This summary is machine-generated.

This study introduces a resource-efficient one-way quantum repeater using concatenated quantum error-correcting codes. This approach minimizes qubit and operational complexity, enabling reliable long-distance quantum communication networks.

Keywords:
Applied opticsComputational scienceOptical physicsQuantum informationQuantum physics

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Area of Science:

  • Quantum Information Science
  • Quantum Communication Networks
  • Quantum Error Correction

Background:

  • Quantum networks require reliable qubit transmission over long distances.
  • Quantum repeaters are essential for overcoming signal loss and operational errors.
  • Minimizing resource requirements is critical for near-future quantum repeater implementations.

Purpose of the Study:

  • To propose a resource-efficient one-way quantum repeater design.
  • To address both loss and operational errors in quantum communication channels.
  • To enable near-future implementations of long-distance quantum networks.

Main Methods:

  • Utilized code concatenation with a tree-cluster code (inner) and a 5-qubit code (outer).
  • Employed flag-based stabilizer measurements for error detection and correction.
  • Designed specialized repeater nodes to mitigate either loss or operational errors.

Main Results:

  • Demonstrated the ability to bridge intercontinental distances up to 10,000 km.
  • Achieved minimized resource overhead through specialized repeater node functions.
  • Showcased the effectiveness of tailored error-correcting codes for quantum communication.

Conclusions:

  • Tailored quantum error-correcting codes significantly reduce experimental requirements for quantum repeaters.
  • The proposed repeater design offers a viable path towards practical long-distance quantum communication.
  • Specialization of repeater nodes enhances efficiency in combating different error types.