Information and Communications Technology and Policy

Information and Communications Technology and Policy

Information and Communications Technology and Policy ›› 2023, Vol. 49 ›› Issue (7): 53-59.doi: 10.12267/j.issn.2096-5931.2023.07.007

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Continuous-variable quantum key distribution for metropolitan and access networks

ZHANG Yichen1, BIAN Yiming1, WANG Heng2, YU Song1, XU Bingjie2, GUO Hong3   

  1. 1. School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
    2. Institute of Southwestern Communication, Chengdu 610041, China
    3. School of Electronics, Peking University, Beijing 100871, China
  • Received:2023-06-10 Online:2023-07-25 Published:2023-08-03


Continuous-variable quantum key distribution using coherent states is an important means of quantum secure communications. It usually realizes key distillation with theoretical unconditional security through the preparation, transmission and measurement of coherent states. It has the advantages of high compatibility with coherent optics communications, high secret key rate within metropolitan area, supporting point-to-multipoint key distribution, and is suitable for large-scale deployment in metropolitan and access networks. This perspective article reviews the protocols, security theory, systematization, and networking development status of continuous-variable quantum key distribution, sorts out the key technologies used in the application scenarios of metropolitan and access networks, and looks forward to its future development trend.

Key words: quantum secure communications, quantum key distribution, continuous variable, metropolitan and access distance, networking

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