  The quantum modes of a nonlinear Klein Gordon lattice have been computed
numerically [L. Proville, Phys. Rev. B, vol. 71, 104306 (2005)]. The on-site
nonlinearity has been found to lead to a phonon pairing and consequently some
phonon bound states. In the present paper, the time dependent Wannier transform
of these states is shown to exhibit a breather-like behavior, i.e., it is
spatially localized and time-periodic. The typical time the lattice may sustain
such breather states is studied as a function of the trapped energy and the
intersite lattice coupling.
