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'"

Abstract

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. © 2010 The American Physical Society.