Nonlocality without entanglement for multipartite quantum measurements
The research investigates how two-qubit product measurements can be perfectly distinguished when accessed jointly, but not if parties are restricted to local operations and classical communication (LOCC). It establishes a hierarchy of discrimination strategies, showing that adaptive protocols outperform simpler methods. Crucially, it proves that certain multipartite measurement pairs are globally distinguishable but cannot be distinguished across any single split using LOCC.