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The effect of Entanglement Sudden Death (ESD) can arise when entanglinginteractions convert purely bipartite entangled states into more generallyentangled states. As a result, ESD can also be seen as a function ofpartitioning of the system, not just of time, as the system partitioningdefines different (multipartite) entanglement classes. Computing both geometricentanglement hierarchies and the generalization of concurrence allows one todemonstrate that different methods of analysing quantum correlations provideboth qualitative and quantitatively different descriptions of two commonlycited examples of ESD. These results follow directly from the inequivalence ofentanglement and quantum correlations, the later of which can exist in a statewithout the former.

Understanding entanglement sudden death through multipartite entanglement and quantum correlations