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Q: Fachverband Quantenoptik und Photonik

Q 54: Posters: Quantum Optics and Photonics IV

Q 54.49: Poster

Donnerstag, 12. März 2020, 16:30–18:30, Empore Lichthof

Entanglement conditions for multipartite quantum key distribution — •Giacomo Carrara, Gláucia Murta, and Dagmar Bruß — Institut für Theoretische Physik III, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany

Entanglement is an important resource in quantum cryptography and it is known to be necessary to guarantee security in a bipartite quantum key distribution scenario. It is thus interesting to move to the more complex multipartite scenario, where different classes of entanglement can be defined. In particular we will focus on protocols that utilize a shared multipartite state to generate, each round of the protocol, a common bit of raw key shared among all the parties. Most of the multipartite quantum key distribution protocols of this type proposed so far make use of the Greenberger-Horne- Zeilinger (GHZ) state, or some other genuine multipartite entangled state. Here we ask the question whether genuine multipartite entanglement is necessary to achieve secure multipartite conference key agreement or if biseparable states can also be used in protocols based on multipartite states.