Entanglement dynamics for Squeezed Coherent Thermal States in the Jaynes-Cummings model with atoms in Bell and Werner states

Abstract: This paper investigates the dynamics of entanglement within the Jaynes-Cummings model (JCM), focusing on the behavior of atoms in both Bell and Werner states, when subjected to thermal and squeezed photons represented by squeezed coherent thermal states (SCTS). We study the entanglement between the two atoms as well as between atoms and field. Using concurrence and negativity, we have calculated the atom-atom and atom-field entanglements, respectively. The phenomenon of entanglement sudden death (ESD) and how various interactions (such as Ising-type, dipole-dipole, and Kerr-nonlinearity) affect these dynamics are studied. This work compares the effects of these interactions on different subsystems of atom-field system, providing insights into how thermal and quantum noise impact entanglement behavior in these subsystems.