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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Performance Improvement of Atmospheric Continuous-Variable Quantum Key Distribution with Untrusted Source.

Qin Liao1,2, Gang Xiao1, Shaoliang Peng1,3,4

  • 1College of Computer Science and Electronic Engineering, Hunan University, Changsha 410082, China.

Entropy (Basel, Switzerland)
|July 2, 2021
PubMed
Summary

This study addresses security in atmospheric continuous-variable quantum key distribution (ACVQKD) by examining untrusted signal sources. Photon subtraction can enhance ACVQKD performance even with compromised sources.

Keywords:
atmospheric channelcontinuous-variable quantum key distributionentanglement sourcephoton subtraction operation.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication Security
  • Applied Physics

Background:

  • Atmospheric continuous-variable quantum key distribution (ACVQKD) relies on secure signal sources.
  • Realistic quantum communication systems often face compromised or untrusted signal sources.
  • The security and performance of ACVQKD degrade when the signal source is not fully protected.

Purpose of the Study:

  • To investigate the impact of untrusted signal sources on ACVQKD performance.
  • To explore methods for improving ACVQKD security and performance under compromised source conditions.
  • To analyze the effectiveness of non-Gaussian operations in mitigating security risks.

Main Methods:

  • Theoretical analysis of ACVQKD with untrusted signal sources.
  • Introduction and numerical analysis of photon subtraction as a non-Gaussian operation.
  • Simulation of ACVQKD performance with untrusted sources located within the atmospheric channel.

Main Results:

  • ACVQKD performance is significantly reduced when the signal source is untrusted, particularly when located mid-channel.
  • Photon subtraction operation can improve the performance of ACVQKD with untrusted sources.
  • Sender-manipulated photon subtraction notably enhances ACVQKD performance under direct reconciliation with mid-channel untrusted sources.

Conclusions:

  • The assumption of a protected signal source is impractical for real-world ACVQKD.
  • Photon subtraction offers a viable strategy to enhance the security and performance of ACVQKD systems with untrusted sources.
  • Strategic application of photon subtraction, especially by the sender, can overcome performance degradation caused by compromised sources.