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. (2022) Experimental implementation of secure anonymous protocols on an eight-user quantum key distribution network. npj Quantum Information, 8 (1). ISSN 2056-6387
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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 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.
| Item Type: | Article | ||||||||
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| Uncontrolled Keywords: | Quantum information ; Quantum optics ; Information theoy and computation | ||||||||
| Subjects: | NATURAL SCIENCES > Physics | ||||||||
| Divisions: | Division of Experimental Physics Center of Excellence for Advanced Materials and Sensing Devices |
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| Depositing User: | Martin Lončarić | ||||||||
| Date Deposited: | 10 Mar 2022 13:16 | ||||||||
| URI: | http://fulir.irb.hr/id/eprint/7048 | ||||||||
| DOI: | 10.1038/s41534-022-00535-1 |
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