On the relation between quantum Darwinism and approximate quantum Markovianity

TL;DR

This paper explores how approximate quantum Markovianity influences Quantum Darwinism, demonstrating that near-Markovian processes still support Quantum Darwinism and that the presence of Darwinism limits quantum non-Markovianity.

Contribution

It establishes a connection between quantum Darwinism and approximate quantum Markovianity, providing bounds on information backflow and non-Markovianity.

Findings

Quantum Darwinism can persist in approximately Markovian processes.

Presence of Quantum Darwinism restricts information backflow.

Quantum non-Markovianity must be small when Quantum Darwinism is present.

Abstract

There are strong evidences in the literature that quantum non-Markovianity would hinder the presence of Quantum Darwinism. In this Letter, we study the relation between quantum Darwinism and approximate quantum Markovianity for open quantum systems by exploiting the properties of quantum conditional mutual information. We show that for approximately Markovian quantum processes the conditional mutual information still has the scaling property for Quantum Darwinism. Then two general bounds on the backflow of information are obtained, with which we can show that the presence of Quantum Darwinism restricts the information backflow and the quantum non-Markovianity must be small.