Displaced excited squeezed vacuum states and their propertities

We introduce the states D(z)a(+) S(r)\ 0) and examine their properties. Suc h states are checked to be complete vectors via the IWOP (Integration Withi n an Ordered Product of operators) technique. We find larger-scale macrosco pic oscillations of photon distribution after the squeezed vacuum states be ing excited and displaced. On contrary to the bunching photons of the squee zed vacuum states, as the displacing parameter \ z \ and the excitation num ber m are both small, photons coherence can exhibit antibunching effect. Th e quasi-probability distribution functions (Husimi Q(alpha, alpha*) functio n and Wigner W(q, p) function) are derived and their dependences on the thr ee parameters (z, m, r) are discussed. The Wigner function obviously displa ys their nonclassical feature.