# Collisional unfolding of quantum Darwinism

## TL;DR

This paper investigates how quantum Darwinism, the emergence of objective reality from quantum systems, depends on the nature of system-environment interactions using a collision model framework.

## Contribution

It introduces a collision model approach to study quantum Darwinism, showing how tuning interactions affects objectivity emergence and highlighting the role of mutual decoherence.

## Key findings

- Transition from Darwinistic to encoding environment by tuning interactions
- Mutual decoherence is necessary for quantum Darwinism
- Observation of quantum Darwinism is sensitive to interaction uniformity

## 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.