Entropy and Entanglement of a Single-mode Vacuum Field Interacting with a Ξ-type Three-level Atom with Detuning

Abstract

The evolution of the field entropy and the entanglement between the atom and the field for the system of a single-mode vacuum field interacting with a -type three-level atom have been studied by using the reduced quantum entropy. The influences of the detuning of the light field and the setting of the initial state of the atom on the field entropy and entanglement of the system under consideration are discussed emphatically. It is showed that the detuning of the light field and the setting of the initial state of the atom play an important role for the evolution of the field entropy and the entanglement between the atom and the field. The general conclusions reached are illustrated by numerical results.

Entanglement and purity loss for the system of two 2-level atoms in the presence of the Stark shift

“…A thorough understanding of the dynamical evolution of entanglement of the TCM has obvious implications for the performance of quantum information processing [11][12][13] as well as for our understanding of fundamental quantum mechanics [11]. Some authors investigated the properties of the quantum entanglement in the two atoms [14][15][16][17].…”