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Optimal architectures for long distance quantum communication.

Sreraman Muralidharan1, Linshu Li2, Jungsang Kim3

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Efficient quantum communication over long distances is challenging. This study compares three generations of quantum repeaters (QRs), identifying the best architecture for high-speed quantum key distribution networks.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication
  • Cryptography

Background:

  • Long-distance quantum communication (≥ 1000 km) faces challenges from fiber attenuation and operational errors.
  • Quantum repeaters (QRs) are essential for overcoming these limitations and enhancing communication rates.
  • Existing QR schemes are categorized into three generations based on error correction methods.

Purpose of the Study:

  • To systematically compare the three generations of quantum repeaters.
  • To evaluate the temporal and physical resource costs for each QR generation.
  • To identify the optimal quantum repeater architecture for quantum key distribution (QKD) under specific experimental conditions.

Main Methods:

  • Classification of quantum repeater schemes into three generations.
  • Comparative analysis of resource costs (temporal and physical) for each generation.
  • Identification of optimized QR architectures based on experimental parameters.

Main Results:

  • A systematic comparison of the three generations of quantum repeaters was performed.
  • The cost-effectiveness of temporal and physical resources was evaluated for each generation.
  • The study identifies optimized quantum repeater architectures for specific experimental parameters.

Conclusions:

  • The research provides a roadmap for realizing efficient quantum networks over transcontinental distances.
  • This work aids in selecting the most suitable quantum repeater generation for practical QKD.
  • The findings are crucial for advancing the development of high-performance quantum communication systems.