Decoherence without entanglement and quantum Darwinism

The authors study the quantum-to-classical transition from the perspective of a new exactly solvable collisional model that can induce the same dynamics on a qubit regardless of the level of entanglement with its environment. This property reveals a mechanism for decoherence without system-environment entanglement. The paper also assess the role of entanglement in quantum Darwinism analytically in this setting, and conclude that it only takes place in the presence of quantum correlations between system and environment.