Unconditionally secure digital signatures implemented in an eight-user quantum network

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 (2022) Unconditionally secure digital signatures implemented in an eight-user quantum network. New Journal of Physics, 24 (9). 093038. ISSN 1367-2630

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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.

Item Type:	Article
Uncontrolled Keywords:	quantum networks ; unconditionally secure signature ; digital signature ; quantum communication ; quantum information
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Center of Excellence for Advanced Materials and Sensing Devices
Projects:	Project title Project leader Project code Project type Znanstveni centar izvrsnosti za napredne materijale i senzore-CEMS Marko Kralj; Milko Jakšić; Mario Stipčević; Mile Ivanda KK.01.1.1.01.0001 EK
Depositing User:	Martin Lončarić
Date Deposited:	05 Oct 2022 08:29
URI:	http://fulir.irb.hr/id/eprint/7571
DOI:	10.1088/1367-2630/ac8e25

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