Investigating the quantum discord dynamics with a bipartite split of the multiqubit system in the correlated photon-matter model

TL;DR

This study investigates the dynamics of quantum discord in a complex photon-matter model involving two hydrogen atoms, exploring how quantum correlations evolve under various physical effects in open and closed quantum systems.

Contribution

It introduces a bipartite split approach to analyze quantum discord in a complex multiqubit photon-matter system, extending previous simpler models.

Findings

Quantum discord exhibits regular patterns under different conditions.

Dissipation and bond formation influence quantum correlation dynamics.

Open system effects significantly alter quantum discord evolution.

Abstract

In this paper, we try to study the quantum discord dynamics in a complex correlated photon-matter model, which is modified from the Tavis-Cummings-Hubbard model - a common cavity quantum electrodynamics model. The target model consists of two hydrogen atoms. A neutral hydrogen molecule can be obtained through an association reaction and disintegrated through dissociation reaction. The formation and breaking of covalent bond is accompanied by the creation and annihilation of phonon. Compared with previous efforts, studying the quantum discord dynamics of this complicated system is more challenging than it was for the simple quantum system, which consisted of a single two-level atom. For convenience, we adopt a bipartite split of the multiqubit system and the two-qubit von Neumann projective measurement on the observed subsystem. We attempt to examine the dissipative dynamics in open quantum system in addition to the unitary evolution of closed quantum system. We are dedicated to identifying the regularity of quantum correlation as the basis for future research on more complex quantum systems, specifically including the impacts of nuclei tunneling effect, covalent bond formation strength, and dissipation intensities of photon (phonon) on quantum discord.