Effect of thermal noise on atom-field interaction: Glauber-Lachs versus Mixing

TL;DR

This paper compares the effects of two types of thermal noise on atom-field interactions, showing how photon addition can restore quantum features diminished by thermal noise.

Contribution

It introduces a comparative analysis of Glauber-Lachs and mixing-based thermal noise effects on atom-field dynamics, highlighting noise mitigation via photon addition.

Findings

Glauber-Lachs noise has less impact on quantum features than mixing-based noise.

Thermal noise diminishes collapse-revivals and entanglement in atom-field interactions.

Photon addition restores lost quantum features despite thermal noise presence.

Abstract

Coherent signal containing thermal noise is a mixed state of radiation. There are two distinct classes of such states, a Gaussian state obtained by Glauber-Lachs mixing and a non-Gaussian state obtained by the canonical probabilistic mixing of thermal state and coherent state. Though both these versions are noise-included signal states, the effect of noise is less pronounced in the Glauber-Lachs version. Effects of these two distinct ways of noise addition is considered in the context of atom-field interaction; in particular, temporal evolution of population inversion and atom-field entanglement are studied. Quantum features like the collapse-revivals in the dynamics of population inversion and entanglement are diminished by the presence of thermal noise. It is shown that the features lost due to the presence of thermal noise are restored by the process of photon-addition.