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Experimental implementation of secure anonymous protocols on an eight-user quantum network
arXiv - CS - Emerging Technologies Pub Date : 2020-11-18 , DOI: arxiv-2011.09480
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

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 5 information-theoretically secure anonymity protocols on an 8 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 her identity anonymous. For a network of $n$ users, the protocols retain anonymity for the sender, given less than $n-2$ users are dishonest. This is one of the earliest implementations 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.
更新日期:2020-11-21
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