Experimental upstream transmission of continuous variable quantum key distribution access network

Continuous variable quantum key distribution that can be implemented using only low-cost and off-the-shelf compo-nents reveals great potential in practical large-scale real-ization. Access networks, as a modern network necessity, connect many end-users to the network backbone. In this work, we first demonstrate upstream transmission quantum access networks using continuous variable quantum key dis-tribution. A two-end-user quantum access network is then experimentally realized. Through phase compensation, data synchronization, and other technical upgrades, we achieve a secret key rate of the total network of 390 kbits/s. In addi-tion, we extend the case of a two-end-user quantum access network to the case of a multiplicity of users, and analyze the network capacity in the case of a multiplicity of users by measuring the additive excess noise from different time slots. & COPY; 2023 Optica Publishing Group

Automated summary

This research demonstrates the potential of continuous variable quantum key distribution in practical quantum access networks. A two-end-user network with a secret key rate of 390 kbits/s is achieved through technical upgrades. The network capacity in the case of multiple users is also analyzed.