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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Satellite Quantum Communications When Man-in-the-Middle Attacks Are Excluded.

Tom Vergoossen1, Robert Bedington1, James A Grieve1

  • 1Centre for Quantum Technologies, National University of Singapore, Singapore 117543, Singapore.

Entropy (Basel, Switzerland)
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Summary

Simplified photon key distribution (PKD) protocols offer higher key rates for satellite quantum communications. By using one measurement basis and relaxed security assumptions, PKD improves key generation efficiency, especially under high channel losses.

Keywords:
PKDaccess controlphoton key distributionquantum communicationquantum cryptographyquantum key distributionsatellite QKDthreat model

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Area of Science:

  • Quantum Communications
  • Cybersecurity
  • Satellite Technology

Background:

  • Quantum key distribution (QKD) uses qubit transmission for secure symmetric encryption keys, offering forward security against quantum computing attacks.
  • Existing QKD protocols face limitations in free-space scenarios, particularly with high channel losses and satellite communications.

Purpose of the Study:

  • To propose and analyze simplified quantum communication protocols, termed photon key distribution (PKD), for enhanced free-space and satellite applications.
  • To demonstrate that PKD protocols can achieve improved key rates compared to standard QKD.

Main Methods:

  • Investigated three types of photon sources for PKD protocols.
  • Calculated and compared asymptotic secret key rates for PKD and QKD protocols.
  • Analyzed the impact of relaxed security assumptions and high channel losses on key generation.

Main Results:

  • PKD protocols, utilizing a single measurement basis, approximately double the key rates compared to QKD.
  • PKD enables key generation at significantly higher channel losses than QKD, where privacy amplification becomes prohibitive.
  • Simplified hardware and protocols are feasible for free-space quantum communications under specific security assumptions.

Conclusions:

  • Photon key distribution (PKD) presents a viable and more efficient alternative to QKD for satellite and free-space secure communications.
  • Relaxed security assumptions, coupled with efficient photon sources and single-basis measurements, significantly enhance key generation rates and resilience to loss.