Transições de Landau-Zener em qubits semicondutores

Abstract

In our work we study the dynamics of transitions between quantum states in systems of interest in the context of quantum information. We started by studying a general 2-level system, the strategy used in this problem was our basis for us to study the systems of interest, the first one we considered was the interaction between two qubits in a system formed by two quantum dots coupled by tunneling and the other was a system composed of two general systems of two levels coupled by an exchange interaction, in this case we consider as an example the transition metal dichalcogenides, which are materials with great applicability in condensed matter. In these two physical problems we find the Hamiltonian Landau-Zener and thus we present value regimes that make the population transfer efficient for a target state, in the first case we consider as a target state an indirect exciton state of the system and for the second case a maximally system tangle. In addition, we analyze the dynamics of systems when placing them in interaction with the environment.