Collisional unfolding of quantum Darwinism

We examine the emergence of objectivity via quantum Darwinism through the use of a collision model, i.e., where the dynamics is modeled through sequences of unitary interactions between the system and the individual constituents of the environment, termed "ancillas." By exploiting versatility of this framework, we show that one can transition from a "Darwinistic" to an "encoding" environment by simply tuning their interaction. Furthermore, we establish that in order for a setting to exhibit quantum Darwinism we require a mutual decoherence to occur between the system and environmental ancillas, thus showing that system decoherence alone is not sufficient. Finally, we demonstrate that the observation of quantum Darwinism is sensitive to a nonuniform system-environment interaction.
Science Foundation Ireland Starting Investigator Research Grant "SpeedDemon"; Royal Society Newton Mobility Grant; European Union (European Union); Horizon 2020; European Union Collaborative Project QuProCS; Scientific and Technological Research Council of Turkey (TÜBİTAK); DfE-SFI Investigator Program; H2020 Collaborative Project TEQ; COST Action "QTSpace"; FFABR