Abstract: Continuous-variable quantum key distribution ( CV-QKD) can share information-theoretical secure keys between two parties over an insecure quantum channel. It has wide range of application prospects in the field of information security. The data post-processing unit is an indispensable part of the CV-QKD system. This article first explains the important role of the two sub-processes ( data reconciliation and privacy amplification ) of the postprocessing and its impact on the system; then it introduces the basic principles, main schemes, and related research progress of the two sub-processes, respectively. Finally, the future technical development route of the data postprocessing is discussed.

Key words: quantum key distribution, continuous-variable, postprocessing, data reconciliation, privacy amplification