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The ability to know and verifiably demonstrate the origins of messages canoften be as important as encrypting the message itself. Here we present anexperimental demonstration of an unconditionally secure digital signature (USS)protocol implemented for the first time, to the best of our knowledge, on afully connected quantum network without trusted nodes. Our USS protocol issecure against forging, repudiation and messages are transferrable. We show thefeasibility of unconditionally secure signatures using only bi-partiteentangled states distributed throughout the network and experimentally evaluatethe performance of the protocol in real world scenarios with varying messagelengths.

Unconditionally secure digital signatures implemented in an 8-user quantum network