Quantum Computation and Information Seminar 

11/07/2006, 14:00 — 15:00 — Room P6, Mathematics Building
Josep Batle Vallespir, U Balearic Islands

Entanglement, speed of quantum evolution and entropic inequalities

It has been recently pointed that, for certain classes of states, quantum entanglement enhances the "speed" of evolution of composite quantum systems, as measured by the time a given initial state requires to evolve to an orthogonal state. We provide a systematic study of this effect for pure states of bipartite systems of low dimensionality, considering both distinguishable (two-qubits) subsystems, and systems constituted of two indistinguishable particles. Mixed states are also considered. Finally, we discuss the entropic separability criterion and the so-called maximally entangled mixed states (MEMS).