  Pulses applied to an inhomogeneously broadened set of harmonic oscillators,
previously prepared in squeezed states, can lead to a recovery of coherence,
manifesting itself as echoes, similar to those exhibited by an ensemble of
spins when excited by properly designed electromagnetic pulses. Such echoes, of
classical or quantum nature, are expected to arise in the squeezing of linear
systems of various sorts and, in particular, light and vibrational modes.
