Generation of Four-photon Coherent States via Non-resonant Interaction of a Degenerate V-type Atom with Single-mode Cavity Field
利用V型原子与单模光场的非共振相互作用制备四光子相干态

A new scheme of generating the four-photon coherent states is presented through interaction of a degenerate V-type three-level atom with single-mode coherent state cavity field of large amplitude under far-off resonant condition. It is impossible to generate the coherent states with more than four-component by the same method mentioned above. That is, the four-photon coherent states remain unchanged in the cavity when the third atom with the same velocity as the second atom is injected into the cavity.