Superpositions of coherent states and squeezing effects in a mesoscopic Josephson junction

We consider a mesoscopic Josephson junction in a circular superconducting r ing which encloses a magneto static flux. It is shown that with the junctio n being initially prepared in its lowest energy level the state of the junc tion can evolve in a quantum superposition of two coherent states, and sque ezing can exist in such system.