Entanglement protection induced by mixed noise

TL;DR

This paper demonstrates that mixed noise, especially high-frequency components, can paradoxically protect entanglement in a two-atom-cavity system by suppressing decoherence, challenging the traditional view of noise as purely detrimental.

Contribution

It reveals the mechanism by which mixed noise with high-frequency components can protect entanglement, supported by analytical derivations and numerical simulations.

Findings

High-frequency noise suppresses decoherence in the system.

Entanglement protection depends on the proportion of high-frequency components.

Different noise types like Ornstein-Uhlenbeck, flicker, and telegraph noise can induce protection.

Abstract

Contrary to the conventional view that noise is detrimental, we show that mixed noise can protect entanglement in a two-atom-cavity system. Specifically, the leakage of the cavity and the stochastic atom-cavity couplings are modeled as two types of noises. From the analytical derivation of the dynamical equations, the mechanism of the entanglement protection is revealed as the high-frequency(HF) noise in the atom-cavity couplings could suppress the decoherence caused by the cavity leakage, thus protect the entanglement. We investigate the entanglement protection induced by mixed noise constructed from diverse noise types, including the Ornstein-Uhlenbeck noise, flicker noise, and telegraph noise. Numerical simulations demonstrate that entanglement protection depends critically on the proportion of HF components in the power spectral density of the mixed noise. Our work establishes that enhanced HF components are essential for effective noise-assisted entanglement protection, offering key insights for noise engineering in practical open quantum systems.