Fig. 1: Conceptual schematic of EA classical communication over a MAC.
From: Entanglement-assisted capacity regions and protocol designs for quantum multiple-access channels

The entanglement source distributes entangled pairs to each sender and the receiver, potentially via a quantum network. Each sender encodes its own message on its share and sends the signal to the receiver. The receiver decodes the messages of all senders by jointly measuring the received signals and the entanglement-assistance locally stored.