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Víctor Zapatero1, Marcos Curty2

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Device-independent quantum key distribution (DIQKD) can be enhanced using qubit amplifiers to overcome distance limitations. This study explores the resources needed for long-distance DIQKD with heralded photons.

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Area of Science:

  • Quantum Information Science
  • Quantum Cryptography

Background:

  • Device-independent quantum key distribution (DIQKD) offers ultimate security against quantum hacking.
  • Current DIQKD faces limitations in achievable distance due to loophole-free Bell inequality violations.
  • Qubit amplifiers can enhance DIQKD by heralding photon arrival, decoupling channel loss from measurement settings.

Purpose of the Study:

  • To investigate photonic-based DIQKD assisted by qubit amplifiers.
  • To analyze resource requirements for achieving long-distance DIQKD in a finite data block size scenario.

Main Methods:

  • Investigating two main types of qubit amplifiers for DIQKD.
  • Analyzing the impact of photodetector efficiency and entanglement source quality.
  • Studying the finite data block size scenario for practical DIQKD.

Main Results:

  • Heralding devices significantly enhance achievable distances in DIQKD.
  • Resource analysis identifies necessary photodetector efficiency and source quality for long-distance DIQKD.
  • Finite data block size considerations are crucial for practical DIQKD implementation.

Conclusions:

  • Qubit amplifiers are essential for overcoming distance limitations in DIQKD.
  • Achieving long-distance DIQKD requires specific photodetector efficiencies and high-quality entanglement sources.
  • This research provides insights into the practical resource requirements for secure, long-distance quantum communication.