Regensburg 2022 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 7: Quantum Communication and Networks
QI 7.2: Vortrag
Mittwoch, 7. September 2022, 15:15–15:30, H8
Secure Anonymous Conferencing in Quantum Networks — •Federico Grasselli1, Gláucia Murta1, Jarn de Jong2, Frederik Hahn3, Dagmar Bruss1, Hermann Kampermann1, and Anna Pappa2,4 — 1Heinrich-Heine-Universität Düsseldorf — 2Technische Universität Berlin — 3Freie Universität Berlin — 4Fraunhofer Institut for Open Communication Systems
Users of quantum networks can securely exchange classical messages via quantum conference key agreement (CKA), which requires the users' identities to be publicly known. In numerous scenarios, however, communicating users demand anonymity with respect to the other network users, the network manager and even between themselves.
We introduce a security framework for anonymous conference key agreement with different levels of anonymity, generalizing the security of quantum key distribution (QKD). We present efficient and noise-tolerant protocols exploiting multipartite Greenberger-Horne-Zeilinger (GHZ) states and prove their security against general quantum attacks in the finite-key regime. We analyze their performance 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 work advocates the use of multipartite entanglement for cryptographic tasks involving several users and enables the implementation of quantum communication protocols beyond QKD and CKA.