Redundancy and Decoherence: Gateways From Quantum World to The Classical

In our daily life experiences we face localized objects which are "here or there" not "here and there". The state of a cat could be "dead and alive" at the same time from a quantum mechanical point of view, which is not in agreement with our classical life observations. If we assume that quantum theory can explain the large scale events, how is it possible that quantumness disappears in the classical world? The answer lies in the interaction between the environment and the system of interest. Quantum Darwinism describes the proliferation of the quantum information of each system in the environment. We will show how entanglement plays a key role in coding and decoding the information of each system in its surrounding environment.