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  4. Secure anonymous conferencing in quantum networks
 
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2022
Journal Article
Title

Secure anonymous conferencing in quantum networks

Abstract
Users of quantum networks can securely communicate via so-called (quantum) conference key agreement-making their identities publicly known. In certain circumstances, however, communicating users demand anonymity. Here, we introduce a security framework for anonymous conference key agreement with different levels of anonymity, which is inspired by the ε-security of quantum key distribution. We present efficient and noise-tolerant protocols exploiting multipartite Greenberger-Horne-Zeilinger (GHZ) states and prove their security in the finite-key regime. We analyze the performance of our protocols in noisy and lossy quantum networks and compare with protocols that only use bipartite entanglement to achieve the same functionalities. Our simulations show that GHZ-based protocols can outperform protocols based on bipartite entanglement and that the advantage increases for protocols with stronger anonymity requirements. Our results strongly advocate the use of multipartite entanglement for cryptographic tasks involving several users.
Author(s)
Grasselli, Federico
Heinrich-Heine-Universität, Düsseldorf  
Murta, Gláucia
Heinrich-Heine-Universität, Düsseldorf  
de Jong, Jarn
Technische Universität Berlin  
Hahn, Frederik
Freie Universität Berlin  
Bruß, Dagmar
Heinrich-Heine-Universität, Düsseldorf  
Kampermann, Hermann
Heinrich-Heine-Universität, Düsseldorf  
Pappa, Anna
Technische Universität Berlin  
Journal
PRX quantum  
Open Access
File(s)
Download (1.64 MB)
Rights
CC BY 4.0: Creative Commons Attribution
DOI
10.1103/PRXQuantum.3.040306
10.24406/publica-615
Language
English
Fraunhofer-Institut für Offene Kommunikationssysteme FOKUS  
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