Initial value represented propagator for semiquantal squeezed state wave packet

The initial-value representation (IVR) of semiclassical propagator for the semiquantal (SQ) squeezed-state wave packet (WP) is examined. The SQ IVR is derived naturally from the coherent-state path-integral theory, in which similarity and difference from the conventional semiclassical methods are transparent. The accuracy of SQ IVR is assessed numerically on assorted schemes of treating the WP width. It is found to yield accurate wave function propagation when the WP width is optimized initially on the SQ potential and its dynamical motion is frozen or damped.