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Unidimensional Two-Way Continuous-Variable Quantum Key Distribution Using Coherent States.

Yiming Bian1, Luyu Huang1, Yichen Zhang1

  • 1State Key Laboratory of Information Photonics and Optical Communications, School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China.

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Summary
This summary is machine-generated.

We introduce a simplified quantum key distribution protocol using coherent states. This new method offers comparable security to existing systems, making it promising for practical applications.

Keywords:
continuous-variable quantum key distributiongeneral two-mode attacksoptimal attack strategytwo-way schemeunidimensional modulation

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Area of Science:

  • Quantum Information Science
  • Quantum Cryptography

Background:

  • Continuous-variable quantum key distribution (CV-QKD) enables secure key exchange.
  • Two-way CV-QKD protocols offer potential advantages but often have complex structures.
  • Existing security analyses can be limited by assumptions about attacker strategies.

Purpose of the Study:

  • To propose a simplified unidimensional two-way continuous-variable quantum key distribution protocol.
  • To analyze the security of this protocol against general two-mode attacks.
  • To evaluate the protocol's performance and application prospects in practical scenarios.

Main Methods:

  • Modulation of a single quadrature of coherent states for system simplification.
  • Security analysis using a general two-mode attack strategy.
  • Derivation of one-mode and optimal two-mode attack strategies.
  • Performance simulations under various attack scenarios.

Main Results:

  • The proposed unidimensional protocol simplifies the two-way system structure.
  • Security analysis demonstrates robustness against general two-mode attacks.
  • Performance is comparable to Gaussian modulated protocols, even against optimal attacks.
  • The protocol maintains good performance under conditions of short distance and high noise.

Conclusions:

  • The unidimensional two-way CV-QKD protocol offers a practical simplification without significant security compromise.
  • It demonstrates a good balance between system complexity and security performance.
  • The protocol shows strong potential for implementation in real-world quantum communication systems.