Effects of classical fluctuating environments on decoherence and bipartite quantum correlations dynamics

TL;DR

This paper investigates how classical static noise affects quantum correlations like entanglement, purity, and coherence in two-qubit systems, revealing conditions for their preservation and differences between common and separate noise configurations.

Contribution

It provides a comparative analysis of quantum correlation dynamics under classical static noise, highlighting the protective role of common noise and the phenomena of entanglement sudden death and rebirth.

Findings

Quantum correlations decay faster under static noise in separate configurations.

Common noise configurations better preserve quantum correlations than separate ones.

Concurrence effectively detects entanglement sudden death and revival phenomena.

Abstract

We address the time evolution of the quantum correlations ($QCs$) such as entanglement, purity, and coherence for a model of two non-interacting qubits initially prepared as a maximally entangled bipartite state. We contrast the comparative potential of the classical fields to preserve these $QCs$ in the noisy and noiseless realms. We also disclose the characteristic dynamical behavior of the $QCs$ of the two-qubit state under the static noisy effects originating from the common and different configuration models. We show that there is a direct connection between the fluctuations allowed by an environment and the $QCs$ preservation. Due to the static noisy dephasing effects, the $QCs$ are suppressed, resulting in the separability of the two-qubit entangled state after a finite duration. Here, the $QCs$ decay effects are found much smaller in the common configuration model than that of the opponent. Furthermore, this protection of the $QCs$ under static noise for large intervals is entirely attributable to the existence of the entanglement sudden death and birth phenomenon. Most importantly, we found the bipartite $QCs$ less fragile than the tripartite ones in comparison under the static noise. In the case of the measures, the concurrence is found to be sharper for showing the entanglement sudden death and birth revivals in comparison to the purity and decoherence.