Experimental implementation of secure anonymous protocols on an eight-user quantum key distribution network

Zixin Huang*, Siddarth Koduru Joshi*, Djeylan Aktas, Cosmo Lupo, Armanda O. Quintavalle, Natarajan Venkatachalam, Sören Wengerowsky, Martin Lončarić, Sebastian Philipp Neumann, Bo Liu, Željko Samec, Laurent Kling, Mario Stipčević, Rupert Ursin, John G. Rarity

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

14 Citations (Scopus)


Anonymity in networked communication is vital for many privacy-preserving tasks. Secure key distribution alone is insufficient for high-security communications. Often, knowing who transmits a message to whom and when must also be kept hidden from an adversary. Here, we experimentally demonstrate five information-theoretically secure anonymity protocols on an eight user city-wide quantum network using polarisation entangled photon pairs. At the heart of these protocols is anonymous broadcasting, which is a cryptographic primitive that allows one user to reveal one bit of information while keeping their identity anonymous. For a network of n users, the protocols retain anonymity for the sender, given that no more than n − 2 users are colluding. This is an implementation of genuine multi-user cryptographic protocols beyond standard QKD. Our anonymous protocols enhance the functionality of any fully-connected Quantum Key Distribution network without trusted nodes.
Original languageEnglish
Article number25
Journalnpj Quantum Information
Issue number1
Publication statusPublished - 7 Mar 2022

Bibliographical note

Publisher Copyright:
© 2022, The Author(s).


  • quant-ph
  • cs.CR
  • cs.ET


Dive into the research topics of 'Experimental implementation of secure anonymous protocols on an eight-user quantum key distribution network'. Together they form a unique fingerprint.

Cite this