Unconditionally secure digital signatures implemented in an eight-user quantum network*Correspondence and requests for materials should be addressed to Siddarth Koduru Joshi. (1st September 2022)

• Record Type: Journal Article
• Authors: Pelet, Yoann; Puthoor, Ittoop Vergheese; Venkatachalam, Natarajan; Wengerowsky, Sören; Lončarić, Martin; Neumann, Sebastian Philipp; Liu, Bo; Samec, Željko; Stipčević, Mario; Ursin, Rupert; Andersson, Erika; Rarity, John G; Aktas, Djeylan; Joshi, Siddarth Koduru
• Is Part Of: New journal of physics. Volume 24:Number 9(2022)
• Publication Date: 2022-09-01
• Subjects: quantum networks -- unconditionally secure signature -- digital signature -- quantum communication -- quantum information; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/ac8e25
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: The ability to know and verifiably demonstrate the origins of messages can often be as important as encrypting the message itself. Here we present an experimental demonstration of an unconditionally secure digital signature (USS) protocol implemented for the first time, to the best of our knowledge, on a fully connected quantum network without trusted nodes. We choose a USS protocol which is secure against forging, repudiation and messages are transferrable. We show the feasibility of unconditionally secure signatures using only bi-partite entangled states distributed throughout the network and experimentally evaluate the performance of the protocol in real world scenarios with varying message lengths.