The entanglement properties of the SU(1,1)-related coherent fields interacting with a moving atom via the two-photon transition are investigated. We discuss the quantum entanglement between the SU(1,1)-related coherent fields and the moving atom by using the quantum reduced entropy and that...

The entanglement between a Λ-type three-levels atom and its spontaneous emission field is studied by using the quantum entropy. The results show that, there is a steady state entanglement between the Λ-type three-level atom and its spontaneous emission field. The entanglement between the...

The entropy squeezing of a two-level atom in motion interacting with a quantized field is investigated. It is shown that the information entropy squeezing is more precise than the variance squeezing as a measure of the atomic squeezing and the moving atom may exhibit long time entropy squeezing...

The effects of the atomic motion and of the field-mode structure, on the evolution of the field entropy and the production of the Schrödinger-cat state are examined in the Jaynes–Cummings model. The results show that the atomic motion and the field-mode structure play an important role in the...

We have investigated the evolution of the field quantum entropy and the entanglement of the atom-field in the Jaynes-Cummings model without the rotating-wave approximation, and examined the effects of the virtual-photon processes (the counter-rotating terms) on the evolution of the field quantum...