Generation for Entangled Squeezed Coherent States of Two Cavity Modes

We propose a scheme to produce pure and entangled squeezed coherent state. Under the strong classical driven condition, three Sigma-type artificial three-level atoms interact with a doubly resonant cavity by initially preparing the artificial atoms in certain states, successionally. It is shown that an entangled squeezed coherent state can be generated from the product state of the two cavity-mode vacuum fields.