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

Yoann Pelet, Ittoop Vergheese Puthoor, Natarajan Venkatachalam, Sören Wengerowsky, Martin Lončarić, Sebastian Philipp Neumann, Bo Liu, Željko Samec, Mario Stipčević, Rupert Ursin, Erika Andersson, John G. Rarity, Djeylan Aktas, Siddarth Koduru Joshi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
7 Downloads (Pure)


The ability to know and verifiably demonstrate the origins of messages can often be as important as encrypting the message itself. Here we present an experimental demonstration of an unconditionally secure digital signature (USS) protocol implemented for the first time, to the best of our knowledge, on a fully connected quantum network without trusted nodes. We choose a USS protocol which is secure against forging, repudiation and messages are transferrable. We show the feasibility of unconditionally secure signatures using only bi-partite entangled states distributed throughout the network and experimentally evaluate the performance of the protocol in real world scenarios with varying message lengths.

Original languageEnglish
Article number093038
JournalNew Journal of Physics
Issue number9
Publication statusPublished - 3 Oct 2022


  • digital signature
  • quantum communication
  • quantum information
  • quantum networks
  • unconditionally secure signature

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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