Quantum discord induced by white noises

TL;DR

This paper explores how white noise can induce and influence quantum discord between two atoms in a cavity, revealing conditions under which noise enhances quantum correlations.

Contribution

It demonstrates that white noise can generate steady-state quantum discord between atoms, with effects depending on how noise is applied to the system.

Findings

White noise can induce nonzero steady-state quantum discord.

Simultaneous white noise on atoms and cavity destroys quantum discord.

White noise can play a constructive role in quantum correlation generation.

Abstract

We discuss the creation of quantum discord between two two-level atoms trapped in an optical cavity in a noisy environment. It is shown that nonzero steady-state quantum discord between atoms can be obtained when the white-noise field is separately imposed on atoms or cavity mode, while the steady-state quantum discord reaches zero if both cavity mode and atoms are driven simultaneously by white-noise fields. In particular, we demonstrate that white-noise field in different cases can play a variously constructive role in the generation of quantum discord.