We present a fully connected quantum network architecture in which a
single entangled photon source distributes quantum states to 4
users. Our network architecture thus minimizes the resources
required of each user without sacrificing security or functionality.
As no adaptations of the source are required to add users, the
network can readily be scaled to a large number of clients, whereby
no trust in the provider of the quantum source is required. Unlike
previous attempts at multi-user networks, which have been based on
active components, and thus limited to some duty cycle, our
implementation is fully passive and thus provides the potential for
unprecedented quantum communication speeds. We experimentally
demonstrate the feasibility of our approach using a single source of
bi-partite polarization entanglement which is multiplexed into 12
wavelength channels to distribute 6 states between 4 users in a
fully connected graph using only 1 fiber and polarization analysis
module per user.