Entanglement of Quantum Evolutions
  The notion of entanglement can be naturally extended from quantum-states to the level of general quantum evolutions. This is achieved by considering multi-partite unitary transformations as elements of a multi-partite Hilbert space and then extended to general quantum operations. We show some connection between this entanglement and the entangling capabilities of the quantum evolution. 
Paolo Zanardi (1,2) ((1) Institute for Scientific Interchange (ISI)   Foundation, (2) Istituto Nazionale per la Fisica della...