Quantum Properties Of The Field And The Atom In The Jaynes-Cummings Model With Detunong

By the quantum theory, we present the evolution of linear entropy in the phase-exhausting chamber, where two identical photons in the 2-level system interact with the coherent field under the condition of large disarrangement. We discuss the effect of different initial atomic status, the mean photon number and the decay constant on the photon linear entropy (PLE), the atom linear entropy (ALE) and the system photon-atom linear entropy (PALE). The results show that when the atom initially stays either in ground state or in the excited state the evolutions of the PLE and ALE are identical, but the PALE maintains zero. Besides, when the atom initially locates in the coherent state in which the probability of the ground state and excited one is equal, there are two points we want to mention. One is that when the mean photon number increases, the PALE evolution versus time is the same as the PLE and ALE ones. The other is that at the temperature of given value, the ALE is invariable while the time for PALE and PLE to reach the stable value shortens as the decay constant X increases.We also discuss the effect of Sand the initial compression factor r of optical field on the optical field compress. Here Sis the disarrangement value of the field variable pattern in the system, in which the non-resonant interaction takes place between double mode compression vacuum field and the A-form 3-level atom. The results shows that the optical field constricts regularly and the degree of the constriction strongly depends on the r and δ.