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

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

Izvornik
Npj Quantum Information (2056-6387) 8 (2022), 1; 25, 7

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Quantum information ; Quantum optics ; Information theoy and computation

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA