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Nitin Jain1, Hou-Man Chin2,3, Hossein Mani2

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This study introduces a continuous-variable quantum key distribution (QKD) system achieving universal composability. The new system generates secure, composable keys using a finite number of quantum states, enhancing practical security for QKD applications.

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Area of Science:

  • Quantum Information Science
  • Cryptography
  • Telecommunications

Background:

  • Quantum Key Distribution (QKD) systems require universal composability for secure cryptographic applications.
  • Theoretical security proofs for QKD often assume an infinite number of quantum states, which is impractical.
  • Continuous-variable (CV) QKD, while suitable for telecom infrastructure, has faced challenges in demonstrating composability due to proof limitations.

Purpose of the Study:

  • To develop a CV-QKD system capable of universal composability with a finite number of quantum states.
  • To overcome the limitations of existing security proofs that require a large number of distributed quantum states.
  • To enhance the practicality, performance, and security of CV-QKD systems.

Main Methods:

  • Implementation of a Gaussian-modulated coherent state CV-QKD system.
  • Development of an improved security proof accommodating a finite number of quantum states (N).
  • Optimization of system operation for speed, low noise, and high stability.

Main Results:

  • Demonstration of a CV-QKD system generating composable keys secure against collective attacks.
  • Successful key generation with N ≈ 2 × 10^8 coherent states.
  • Achieved universal composability, a crucial security requirement.

Conclusions:

  • The developed CV-QKD system represents a significant advancement in practical and secure key distribution.
  • This work bridges the gap between CV-QKD and discrete-variable QKD in terms of performance and security.
  • The findings pave the way for more widespread adoption of CV-QKD in secure communication networks.