The adverse effects of practical passive optical network on continuous-variable quantum key distribution downstream access networks
Luyu Huang, Ziyang Chen, Xiangyu Wang +1 more
An quantum access network, connecting multiple end users and a backbone network in a scalable and cost-effective way with tree or star structures, is suitable to combine with continuous-variable quantum key distribution for network security. Under the realistic condition, in a passive optical network in optical distribution network achieved by a practical passive beam splitter, it is hard to divide the signal into 1/n parts evenly. To well quantify the impact of the imperfection, we modify the formula for secret key rate calculation with the imperfection effect and conduct numerical simulations. The results indicate that if the communication parties neglect this imperfection, Eve can attack the entire network and attain information without the parties’ awareness.
Applied Optics and Photonics China (AOPC)•Dec 18, 2023•0 citations