Self-testing with dishonest parties and entanglement certification in quantum networks




Heinrich-Heine-Universität Düsseldorf

July 19, 2023 2:30 PM

Place: Room 203, Center for Theoretical Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland

Zoom link:

Meeting ID: 844 2780 6931

Access code: nisq


Here we consider the task of device-independent certification of the quantum state distributed in a network when some of the nodes in this network may collude and act dishonestly. We introduce the paradigm of self-testing with dishonest parties and present a protocol to self-test the GHZ state in this framework. We apply this result for state certification in a network with dishonest parties and also provide robust statements about the fidelity of the shared state. Finally, we extend our results to the cluster scenario, where several subgroups of parties may collude during the state certification. Ourfindings provide a new operational motivation for the strong definition of genuine multipartite nonlocality as originally introduced by Svetlichny in [PRD35, 3066 (1987)].