Entangling power of quantum chaotic evolutions via operator entanglement
  We study operator entanglement of the quantum chaotic evolutions. This study shows that properties of the operator entanglement production are qualitatively similar to the properties reported in literature about the pure state entanglement production. This similarity establishes that the operator entanglement quantifies {\it intrinsic} entangling power of an operator. The term `intrinsic' suggests that this measure is independent of any specific choice of initial states. 
Jayendra N. Bandyopadhyay and Arul Lakshminarayan