Controlling decoherence : theory and experiments

This year's lecture focused on the various methods of decoherence control that have been developed in recent years in various fields of quantum information processing. Some methods apply to the correction of classical noise, in principle measurable and exactly compensable. Other, more sophisticated methods seek to correct the effects of quantum coupling to the environment, which leads to a loss of information that is in principle irreversible. The lecture was based explicitly on the formalism for describing the evolution of an open system, coupled to a large reservoir, which we had established during the previous year.