  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.
