An atom with only two energy eigenvalues is described by a two-dimensional state space spanned by the two energy eigenstates is called a two-level atom. We consider the interaction between a two-level atom system with a constant velocity. An analytic solution of the systems which interacts with a quantized field is provided. Furthermore, the significant effect of the temperature on ... إقراء المزيد

In this book, various types of entanglement have been discussed for systems start from a pure state or mixed states and many new features have been discovered. A general expression of the mixed state entanglement is obtained with the physical significance (with or without the diagonal approximation treatments). The particular advantages of using Shannon entropy are highlighted and the information ... إقراء المزيد

* _ Abdel-Aty,_Quantum Information Entropy, Chapter II, in “Aspects of Optical Sciences and Quantum Information”, ed. _M. Abdel-Aty_, (Research Signpost Publishing, 2007) إقراء المزيد

In this paper a novel analytical method is applied to the problem of investigating the fidelity and linear entropy of a three-level system in the presence of a photonic band gap. Using this analytic solution, we conclusively calculate the fidelity and linear entropy, related particularly to the entanglement phenomena. We demonstrate how fluctuations in the fidelity and linear entropy are ... إقراء المزيد