TY - JOUR
T1 - Experimental implementation of secure anonymous protocols on an eight-user quantum key distribution network
AU - Huang, Zixin
AU - Joshi, Siddarth Koduru
AU - Aktas, Djeylan
AU - Lupo, Cosmo
AU - Quintavalle, Armanda O.
AU - Venkatachalam, Natarajan
AU - Wengerowsky, Sören
AU - Lončarić, Martin
AU - Neumann, Sebastian Philipp
AU - Liu, Bo
AU - Samec, Željko
AU - Kling, Laurent
AU - Stipčević, Mario
AU - Ursin, Rupert
AU - Rarity, John G.
N1 - © The Author(s) 2022. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.
PY - 2022/3/7
Y1 - 2022/3/7
N2 - 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.
AB - 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.
KW - Information theory and computation
KW - Quantum information
KW - Quantum optics
UR - http://www.scopus.com/inward/record.url?scp=85126210563&partnerID=8YFLogxK
U2 - 10.1038/s41534-022-00535-1
DO - 10.1038/s41534-022-00535-1
M3 - Article
SN - 2056-6387
VL - 8
SP - 1
EP - 7
JO - npj Quantum Information
JF - npj Quantum Information
IS - 1
M1 - 25
ER -