Relativity and Lorentz Invariance of Entanglement Distillability
  We study entanglement distillability of bipartite mixed spin states under Wigner rotations induced by Lorentz transformations. We define weak and strong criteria for relativistic isoentangled and isodistillable states to characterize relative and invariant behavior of entanglement and distillability. We exemplify these criteria in the context of Werner states, where fully analytical methods can be achieved and all relevant cases presented. 
L. Lamata, M.A. Martin-Delgado, and E. Solano