Displaced Excited Squeezed Vacuum States and Their Propertities

We introduce the states D(z)a\+\{+\+m\}S(r)|0〉 and examine their properties . Such states are checked to be complete vectors via the IWOP (Integration W ithin an Ordered Product of operators) technique. We find largerscale macrosco pic oscillations of photon distribution after the squeezed vacuum states being e xcited and displaced. On contrary to the bunching photons of the squeezed vacuum states　 as the displacing parameter |z| and the excitation number m are both small　 photons coherence can exhibit antibunching effect. The quasiproba bility distribution functions (Husimi Q( 　醆+*) function and Wigner W(q　 p) function) are derived and their dependences on the three parameters (z　m　 r) are discussed. The Wigner function obviously displays their nonclassical fe ature.