Overview on the phenomenon of two-qubit entanglement revivals in classical environments

TL;DR

This paper reviews recent theoretical and experimental findings on entanglement revivals between two qubits in classical environments, discussing interpretations and implications for quantum information and control strategies.

Contribution

It provides a comprehensive overview of entanglement revivals in classical environments, unifying various interpretations and highlighting their significance in quantum information science.

Findings

Recent experimental evidence of entanglement revivals in classical environments

Theoretical models explaining entanglement revivals without back-action

Unified interpretation framework for the phenomenon

Abstract

The occurrence of revivals of quantum entanglement between separated open quantum systems has been shown not only for dissipative non-Markovian quantum environments but also for classical environments in absence of back-action. While the phenomenon is well understood in the first case, the possibility to retrieve entanglement when the composite quantum system is subject to local classical noise has generated a debate regarding its interpretation. This dynamical property of open quantum systems assumes an important role in quantum information theory from both fundamental and practical perspectives. Hybrid quantum-classical systems are in fact promising candidates to investigate the interplay among quantum and classical features and to look for possible control strategies of a quantum system by means of a classical device. Here we present an overview on this topic, reporting the most recent theoretical and experimental results about the revivals of entanglement between two qubits locally interacting with classical environments. We also review and discuss the interpretations provided so far to explain this phenomenon, suggesting that they can be cast under a unified viewpoint.