La portée de l’intrication multipartite dans les états à plusieurs corps

Gilles Parez (LAPTh) 

The characterization of entanglement and its structure in quantum many-body states is a long-standing problem at the interface of condensed matter physics and quantum information. A pivotal question is to understand to what extent two or more regions can remain entangled at large distances. As it turns out, this is more subtle than understanding the range of quantum correlations: strongly correlated states such as resonating valence-bond states and critical ground states can display long-range correlations but only short-range multipartite entanglement. I will discuss how particle statistics and superselection rules also play a role in this problem, and how to understand it within the broader “fate of entanglement” framework, which goes beyond the study of entanglement decay with distance and also applies to finite-temperature systems and nonequilibrium dynamics.

Contact : C. Berthière