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

• URL: http://arxiv.org/abs/2011.09480v1
• Date: Wed, 18 Nov 2020 19:00:01 GMT
• Title: Experimental implementation of secure anonymous protocols on an eight-user quantum network
• Authors: Zixin Huang, Siddarth Koduru Joshi, Djeylan Aktas, Cosmo Lupo, Armanda O. Quintavalle, Natarajan Venkatachalam, S\"oren Wengerowsky, Martin Lon\v{c}ari\'c, Sebastian Philipp Neumann, Bo Liu, \v{Z}eljko Samec, Laurent Kling, Mario Stip\v{c}evi\'c, Rupert Ursin, John G. Rarity
• Abstract summary: We experimentally demonstrate 5 information-theoretically secure anonymity protocols on an 8 user city-wide quantum network. For a network of $n$ users, the protocols retain anonymity for the sender, given less than $n-2$ users are dishonest.
• Score: 2.5516484173114855
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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