Local invariants for multi-partite entangled states allowing for a simple entanglement criterion (pp383-395)
        H. Aschauer, J. Calsamiglia, M. Hein, and Hans J. Briegel
          doi: https://doi.org/10.26421/QIC4.5-4
Abstracts: We present local invariants of multi-partite pure or mixed states, which can be easily calculated and have a straight-forward physical meaning. As an application, we derive a new entanglement criterion for arbitrary mixed states of $n$ parties. The new criterion is weaker than the partial transposition criterion but offers advantages for the study of multipartite systems. A straightforward generalization of these invariants allows for the construction of a complete set of observable polynomial invariants.
Key words:  entanglement, local invariants