Quantum Darwinism and Classical Objectivity: A Collision Model Viewpoint

Understanding how a quantum system exchanges information or energy with its surroundings and how this can lead to a classically objective state is a ubiquitous problem. Quantum Darwinism, and the more stringent strong quantum Darwinism and spectrum broadcast structures, provide a framework to understand how specific information is redundantly encoded across the environmental degrees of freedom resulting in classical objectivity. Various tools have been employed to study the phenomenon of quantum Darwinism and in this talk I will focus on one such technique, namely collision models, which are particularly well suited to the task. Their simple structure endows them with great flexibility to probe the limitations of the Darwinistic framework which we will explore in simple spin-systems.