Work

Semi-quantum conference key agreement with GHZ-type states

Year: 2025

Type: article

Abstract: Conference key agreement (CKA) enables multiple parties to establish a shared secret key, and semi-quantum protocols aim to achieve this even when some participants have limited quantum capabilities. We propose a semi-quantum CKA (SQCKA) protocol that leverages on GHZ states. We provide a comprehensive security analysis for our protocol that does not rely on a trusted mediator party. We present information-theoretic security proof, addressing collective attacks within the asymptotic limit of infinitely many rounds. This assumption is practical, as participants can monitor and abort the protocol if deviations from expected noise patterns occur. This advancement enhances the feasibility of SQCKA protocols for real-world applications, ensuring strong security without complex network topologies or third-party trust.

Source: Journal of Physics A Mathematical and Theoretical

DOI: 10.1088/1751-8121/ae1c7f

Authors: Rúben Barreiro, Walter O Krawec, Paulo Mateus, Nikola Paunković, André Souto

Institutions: University of Lisbon, Instituto de Telecomunicações, Instituto Superior Técnico, University of Connecticut, Laboratório de Sistemas Informáticos de Grande Escala

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funder: BioXFEL Science and Technology Center

Award: G7941027020