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This study explores the implementation of a Quantum Key Distribution (QKD) system using a Trusted Node (TN) and an optical switch. The TN is used for transmitting the end-to-end encryption key from one QKD link to the next, while the optical switch allows to reduce the number of required Alice/Bob pairs, thereby lowering costs. A testbed was developed within the FranceQCI project to evaluate the performance of the optical switch-based QKD system in the context of Air Traffic Control (ATC) data transmission. The setup involved two polarization-based QKD transmitters, the optical switch, a single receiver, and two encryptors. Results show that the optical switch effectively allows the transmission of end-to-end encryption keys. Furthermore, the availability of encryption keys remains sufficient even during physical link interruptions, ensuring data availability and integrity. User-centric evaluations demonstrated that the QKD-based encryption process did not significantly impact data latency, aligning with operational requirements.

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QKD-Encryption of Air Traffic Control Data with Negligible Extra Latency

  • 会议论文

  • 发表日期：

    2026年

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  • Abraham Sotomayor,
  • Paulette Gavignet,
  • Patrice Robert,
  • Sandrine Gravant,
  • Luca Calderaro,
  • Alessandro Emanuele,
  • Costantino Agnesi,
  • Gonzague Reydet,
  • Olivier Ferrouillat,
  • Stephanie Molin,
  • Nicolas Courtel,
  • Sylvain Fournier-Bazoune,
  • Alexandre Tremon,
  • Thierry Andre

摘要

This study explores the implementation of a Quantum Key Distribution (QKD) system using a Trusted Node (TN) and an optical switch. The TN is used for transmitting the end-to-end encryption key from one QKD link to the next, while the optical switch allows to reduce the number of required Alice/Bob pairs, thereby lowering costs. A testbed was developed within the FranceQCI project to evaluate the performance of the optical switch-based QKD system in the context of Air Traffic Control (ATC) data transmission. The setup involved two polarization-based QKD transmitters, the optical switch, a single receiver, and two encryptors. Results show that the optical switch effectively allows the transmission of end-to-end encryption keys. Furthermore, the availability of encryption keys remains sufficient even during physical link interruptions, ensuring data availability and integrity. User-centric evaluations demonstrated that the QKD-based encryption process did not significantly impact data latency, aligning with operational requirements.