Segre variety, conifold, Hopf fibration, and separable multi-qubit   states
  We establish relations between Segre variety, conifold, Hopf fibration, and separable sets of pure two-qubit states. Moreover, we investigate the geometry and topology of separable sets of pure multi-qubit states based on a complex multi-projective Segre variety and higher order Hopf fibration. 
Hoshang Heydari