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Q: Fachverband Quantenoptik und Photonik

Q 40: Poster: Quantum Optics and Photonics III

Q 40.9: Poster

Dienstag, 6. März 2018, 16:15–18:15, Zelt West

Security of multipartite QKD protocols with finite resources — •Federico Grasselli, Hermann Kampermann, and Dagmar Bruß — Institut für Theoretische Physik III, Heinrich-Heine-Universität, Düsseldorf, Deutschland

We analyze the security of multipartite quantum key distribution protocols implemented with genuine multipartite entangled states as resources [1]. In particular, we focus on finite-size effects.
For this purpose, we consider the generalizations of the notions of security, correctness, secrecy and leakage of a protocol in the multipartite scenario. We then extend the upper bounds to the key length and to the leakage of an optimal error correction scheme -known for bipartite protocols- to the multipartite case.
Furthermore, we present a computable secret key rate for finite resources in the presence of coherent attacks, extending similar results already obtained in the bipartite case [2].

[1]: M. Epping, H. Kampermann, C. Macchiavello, D. Bruß. New J. Phys. 19 093012, 2017.

[2]: M. Mertz, H. Kampermann, S. Bratzik, D. Bruß. Phys. Rev. A 87 012315, 2013.