Criteria for non-$k$-separability of $n$-partite quantum states

Abstract

We develop separability criteria to identify non-$k$-separability $(k=2,3,\dots ,n)$ and genuine multipartite entanglement in different classes of mixed $n$-partite quantum states using elements of density matrices. With the help of these criteria, we detect non-$k$-separability in $n$-qudit GHZ and W states respectively added with white noise. We also discuss the experimental implementation of our criteria by means of local observables.

9 pages, accepted for publication in EPJD

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