Abstract:

In recent years, new trials and expansions have been made in the application of quantum secure communication based on Quantum Key Distribution (QKD). In this paper, based on the progress and limitations of QKD in terms of transmission distance and key generation rate, we propose that quantum secure communication based on QKD can be divided into two modes: online distribution of quantum keys and online & offline combined distribution of quantum keys. The advantages and disadvantages of the two modes are analyzed, and the typical application scenarios of these two modes are introduced. The problems faced by QKD in terms of technology, equipment, networking, and network capability provision are discussed, and some solutions are proposed. The application of quantum secure communication is also closely related to the development of traditional encrypted communication services, systems and networks, and needs to be actively promoted by the industry chain.

Key words: quantum secure communication, quantum key distribution, application