Entanglement of three-qubit geometry
  Geometric quantum mechanics aims to express the physical properties of quantum systems in terms of geometrical features preferentially selected in the space of pure states. Geometric characterisations are given here for systems of one, two, and three spin-1/2 particles, drawing attention to the classification of quantum states into entanglement types. 
Dorje C. Brody, Anna C. T. Gustavsson, Lane P. Hughston