Entangling operations and their implementation using a small amount of   entanglement
  We study when a physical operation can produce entanglement between two systems initially disentangled. The formalism we develop allows to show that one can perform certain non-local operations with unit probability by performing local measurement on states that are weakly entangled. 
J. I. Cirac, W. D\"ur, B. Kraus, and M. Lewenstein