Dissipation, dephasing and quantum Darwinism in qubit systems with random unitary interactions

TL;DR

This paper explores how dissipation and dephasing affect quantum Darwinism in qubit systems, using a generalized model with random two-qubit interactions that induce entanglement, dissipation, and dephasing, and analyzes the resulting stationary states.

Contribution

It introduces a generalized qubit model with random interactions to study the combined effects of dissipation and dephasing on quantum Darwinism, extending Zurek's original framework.

Findings

Stationary states show complex influence of entanglement, dissipation, and dephasing.

Random interactions lead to diverse stationary state behaviors.

Quantum Darwinism is affected by the interplay of these quantum processes.

Abstract

We investigate the influence of dissipation and decoherence on quantum Darwinism by generalizing Zurek's original qubit model of decoherence and the establishment of pointer states (Zurek, Nature Physics 5, 181 - 188 (2009)). Our model allows for repeated multiple qubit-qubit couplings between system and environment which are described by randomly applied two-qubit quantum operations inducing entanglement, dissipation and dephasing. The resulting stationary qubit states of system and environment are investigated. They exhibit the intricate influence of entanglement generation, dissipation and dephasing on this characteristic quantum phenomenon.