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  3. Experimental Composable Key Distribution Using Discrete-modulated Continuous Variable Quantum Cryptography.
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  3. Experimental Composable Key Distribution Using Discrete-modulated Continuous Variable Quantum Cryptography.

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Experimental composable key distribution using discrete-modulated continuous variable quantum cryptography.

Adnan A E Hajomer1, Florian Kanitschar2,3, Nitin Jain4

  • 1Center for Macroscopic Quantum States (bigQ), Department of Physics, Technical University of Denmark, 2800, Kongens Lyngby, Denmark. aaeha@dtu.dk.

Light, Science & Applications
|July 28, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

Researchers demonstrated a four-state discrete modulated (DM) continuous variable (CV) quantum key distribution (QKD) system. This system achieves secure key generation over a 20 km fiber channel, paving the way for practical quantum-safe communication networks.

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Area of Science:

  • Quantum Information Science
  • Quantum Cryptography
  • Telecommunications Technology

Background:

  • Secure data communication relies on secure key exchange over public channels.
  • Quantum Key Distribution (QKD) offers information-theoretic security using quantum physics principles.
  • Discrete Modulated (DM) Continuous Variable (CV) QKD is promising for scalable quantum-safe communication due to its simplicity and compatibility with existing infrastructure.

Purpose of the Study:

  • To experimentally demonstrate a four-state DM CVQKD system.
  • To generate composable finite-size keys secure against collective attacks.
  • To assess the feasibility of large-scale deployment using standard telecommunication components.

Main Methods:

  • Experimental implementation of a four-state DM CVQKD system.
  • Transmission of 2.3 × 10^9 coherent quantum states over a 20 km fiber channel.
  • Application of an advanced security proof and meticulous parameter selection.

    • Main Results:

    • Successful generation of composable finite-size keys.
    • Achievement of a positive composable key rate of 11.04 × 10^-3 bits/symbol.
    • Demonstration of secure key distribution over a 20 km fiber link.

    Conclusions:

    • The experimental demonstration represents a significant advancement in practical QKD.
    • The system's performance highlights the potential for high-performance, cost-effective quantum key distribution networks.
    • This work supports the large-scale deployment of quantum-safe communication using standard telecommunication technologies.