Applied Mathematics & Information Sciences
On a Moving Four-Level λ-Type Atom Interacting with a Single-Mode Quantized Field in Intensity-Dependent Coupling
The interaction between a moving four-level atom and a single-mode cavity ﬁeld are discussed in the presence of intensity dependent atom ﬁeld coupling. For this purpose, we ﬁrst demonstrate the feasibility of the eﬀective Hamiltonian and evaluate the explicit time-dependent form of the state vector of the whole system by choosing special initial conditions for atom, ﬁeld. Considering the ﬁeld to be initially in a coherent state, and the atom is initially prepared in the excited state. The wave function is obtained in three diﬀerent cases: resonance case, oﬀ-resonance case, ﬁnally we obtained it in the general form. We study the nonclassical features of the system such as Atomic inversion, Filed entropy, purity, Fidelity, Mandel Q-parameter, Mean photon number and normal squeezing. The results show that, The temporal evolution of ﬁeld entropy (entanglement), Mandel parameter, mean photon number and normal squeezing are sensitive to intensity-dependent coupling, which changes the quantum statistical behaviour of the atom-ﬁeld state to a full sub-Poissonian statistics. Finally, conclusions and some features and comments are given.
Digital Object Identifier (DOI)
M. El-Shahat, Tarek and E. Thabet, Lamia
"On a Moving Four-Level λ-Type Atom Interacting with a Single-Mode Quantized Field in Intensity-Dependent Coupling,"
Applied Mathematics & Information Sciences: Vol. 12:
1, Article 18.
Available at: https://digitalcommons.aaru.edu.jo/amis/vol12/iss1/18