Entangled squeezed coherent states: generation and their nonclassical properties in comparison with other entangled states

In this paper, at first we consider special type of entangled states named “entangled squeezed coherent states” by using squeezed coherent states. Next, we study the entanglement characteristics of these entangled states by evaluating concurrence. In the continuation, we investigate some of their nonclassical properties such as quantum statistics which contained sub-Poissonian photon statistics and the oscillatory photon number distribution, second-order correlation function and quadrature squeezing for different squeezing values of two modes. In addition, we compare the results of the “entangled squeezed coherent states” with those of the common entangled states such as “entangled coherent states”, “entangled squeezed vacuum states” and “entangled squeezed one-photon states”. Finally, using the proposed theoretical scheme in the previous works, we will generate the entangled squeezed coherent states with different initial conditions. In this scheme, a Λ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Lambda$$\end{document}-type three-level atom interacts with the two-mode quantized field in the presence of two strong classical fields.