Collisional unfolding of quantum Darwinism

Abstract

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 non-uniform system-environment interaction.

7 pages, 3 figures. Close to published version

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Cited by in corpus (4)

• Quantum Darwinism in a composite system: Objectivity versus classicality
• Correlations, information backflow, and objectivity in a class of pure dephasing models
• Decoherence and information encoding in quantum reference frames
• Many-body localization and the emergence of quantum darwinism