J. d. Vicente: Any star network of bipartite pure entangled states is genuine multipartite non-local
Channel: Centrum Fizyki Teoretycznej PAN
Date: 2021-04-24

Julio de Vicente (Charles III University of Madrid)
Any star network of bipartite pure entangled states is genuine multipartite non-local.
Quantum non-locality and entanglement are inextricably linked. However, while entanglement is necessary to achieve non-locality, it is not sufficient in the standard Bell scenario. Notwithstanding, this does not preclude the equivalence of entanglement and non-locality if the set of possible states is restricted or if more general scenarios are considered. On the one hand, it has been proven that all pure entangled states are nonlocal. On the other hand, it is known that local entangled states distributed in networks can lead to non-local correlations. In this talk I will address these questions in the genuine multipartite scenario. I will show that any star network in which each external node shares an arbitrary pure entangled state with the central node can give rise to genuine multipartite non-local (GMNL) behaviours. Interestingly, I will use this result to prove that all pure genuine multipartite entangled (GME) states are GMNL in the sense that measurements on a finite number of copies of any GME state lead to GMNL behaviours. This is joint work with P. Contreras-Tejada and C. Palazuelos. 
CTP Quantum Information Days (online), 22-24 February 2021.
Center for Theoretical Physics PAS (Warsaw, Poland)