Regensburg 2022 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 7: Quantum Communication and Networks

QI 7.4: Vortrag

Mittwoch, 7. September 2022, 15:45–16:00, H8

Experimental anonymous conference key agreement using linear cluster states — •Lukas Rückle, Jakob Budde, and Stefanie Barz — Institute for Functional Matter and Quantum Technologies and IQST, University of Stuttgart, 70569 Stuttgart

Quantum networks allow for secure communication between more than just two parties. One example is the conference key agreement, where multiple parties exchange a secure key. Interestingly, quantum networks can provide another security feature: protecting the identity of the participants. Here, we realize such anonymous quantum conference key agreement in a linear network architecture using photonic cluster states. We show how different parties of the network can exchange a key anonymously by extracting a smaller GHZ state from the cluster state. We further study how noise affects the finite and asymptotic key rate and show that we achieve a positive asymptotic key rate.