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Q: Fachverband Quantenoptik und Photonik
Q 19: Quantum Information (Quantum Repeater) I
Q 19.2: Vortrag
Montag, 11. März 2019, 16:30–16:45, S HS 001 Chemie
Quantum network routing and local complementation — •Frederik Hahn1, Anna Pappa2, and Jens Eisert1 — 1Freie Universität Berlin, Berlin, Deutschland — 2University College London, London, Großbritannien
Quantum communication between distant parties is based on suitable instances of shared entanglement. For efficiency reasons, in an anticipated quantum network beyond point-to-point communication, it is preferable that many parties can communicate simultaneously over the underlying infrastructure; however, bottlenecks in the network may cause delays. Sharing of multi-partite entangled states between parties offers a solution, allowing for parallel communication. Specifically for the two-pair problem, the butterfly network provides the first instance of such an advantage in a bottleneck scenario. The underlying method differs from standard repeater network approaches in that it uses a graph state instead of maximally entangled pairs to achieve long-distance simultaneous communication. We show how graph theoretic tools, and specifically local complementation, help decrease the number of required measurements compared to usual methods applied in repeater schemes. We consider other examples of network architectures, where deploying local complementation techniques provides an advantage. (The talk is based on arXiv:1805.04559v2)