  Continuous-variable quantum key distribution which can be implemented using
only low-cost and off-the-shelf components reveals great potential in the
practical large-scale realization. Access network as a modern network
necessity, connects multiple end-users to the network backbone. In this work,
we demonstrate the first upstream transmission quantum access networks using
continuous-variable quantum key distribution. A two-end-user quantum access
network is then experimentally realized. Through phase compensation, data
synchronization and other technical upgrades, we achieve 390kbps secret key
rate of the total network. In addition, we extend the case of two-end-user
quantum access network to the case of multiple users, and analyze the network
capacity in the case of multiple users by measuring the additive excess noise
from different time slots.
