In this seminar, I will address a few fundamental questions related to the decoherence and relaxation of quantum systems. In particular I will present the study of the full evolution of a two level system or qubit coupled to a bath composed of non-interacting and interacting electrons and I will focus on the case where the bath exhibits long range order. The interest of this problem is related to quantum computation because in order to construct an efficient quantum computer one needs to understand the effect of the surroundings on the basic building block, i.e., a quantum bit or qubit. Alternatively, these problems are also interesting from the viewpoint of using the two level system as a probe of the physics of the bath.
Presentación de Juliana