Examining the dimensionality of genuine multipartite entanglement
  Entanglement in high-dimensional many-body systems plays an increasingly vital role in the foundations and applications of quantum physics. In the present paper, we introduce a theoretical concept which allows to categorize multipartite states by the number of degrees of freedom being entangled. In this regard, we derive computable and experimentally friendly criteria for arbitrary multipartite qudit systems that enable to examine in how many degrees of freedom a mixed state is genuine multipartite entangled. 
Christoph Spengler, Marcus Huber, Andreas Gabriel, Beatrix C. Hiesmayr
quant-ph