Investigating the quantum discord dynamics in the correlated photon-matter system by using two-qubit projective measurement

In this paper, we try to study the quantum discord dynamics in a complex correlated photon-matter system, which is modified from the Tavis-Cummings-Hubbard model. Compared with previous efforts, we adopt the two-qubit von Neumann projective measurement on the observed subsystem. The target model consists of two hydrogen atoms. The formation and breaking of covalent bond is accompanied by the creation and annihilation of phonon. 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. We are dedicated to identifying the regularity of quantum correlation as the basis for future research on more complex quantum systems, and researching the impacts of nuclei tunneling effect, covalent bond intensity, and dissipation strengths of photon and phonon on quantum discord. We have conducted research on both closed and open systems, respectively.
7 pages, 7 figures. arXiv admin note: text overlap with arXiv:2307.07352