Criterion for K-separability in mixed multipartite states
Andreas Gabriel, Beatrix C. Hiesmayr, Marcus Huber · Quantum Information and Computation · 2010
Using a recently introduced framework, we derive criteria for quantum k-separability,which are easily computed. In the case k = 2, our criteria are equally strong to the bestmethods known so far, while in all other cases there are currently no comparable criteriaknown. We also show how the criteria can be implemented experimentally.