Reply to “Comment on ‘Connection between entanglement and the speed of quantum evolution’ and on ‘Entanglement and the lower bounds on the speed of quantum evolution’ ”
Josep Amengual i Batle, Antoni Borràs, M. Casas, Angel Ricardo Plastino, Angel Ricardo Plastino · Physical Review A · 2010
Chau's Comment deals with the properties exhibited by a particular set of two-qubit states in connection with entanglement and the quantum evolution of some low-dimensional composite systems. However, there is an important aspect of the previously mentioned two-qubit states and of the role they play in relation with the ``speed'' of quantum evolution that was not mentioned by Chau and deserves to be pointed out: for the two-qubit system under consideration, these states require the longest possible absolute time to evolve to an orthogonal state.