Center-of-mass interpretation for bipartite purity analysis of N -party entanglement
Miguel Angel Alonso, Xiao‐Feng Qian, Joseph H. Eberly · Physical Review A · 2016
We provide a graphical description of the entanglement of pure-state multiparty systems based on an analogy between a bipartite purity analysis and the centroid of a collection of point masses. This description applies to quantum systems with $N$ parties, each with an arbitrary number of (discrete) states. The case of $N$ qubits is highlighted for simplicity. This geometric description illustrates some of the restrictions in the form of inequalities that apply to entanglement in multiparty systems.