  The quantum transition between shifted zero-mode wave functions is shown to
be induced by the systematic deformation of topological and non-topological
defects that support the $1$-dim double-well (DW) potential tunneling dynamics.
The topological profile of the zero-mode ground state, $\psi_{0}$, and the
first excited state, $\psi_{1}$, of DW potentials is obtained through the
analytical technique of topological defect deformation. Deformed defects create
two inequivalent topological scenarios connected by a symmetry breaking that
support the quantum conversion of a zero-mode stable vacuum into an unstable
tachyonic quantum state. Our theoretical findings reveal the topological origin
of two-level models where a non-stationary quantum state of unitary evolution,
$\psi_{0} + e^{\mbox{$-i E \,t$}}\psi_{1}$, that exhibits a stable tunneling
dynamics, is converted into a quantum superposition involving a self-vanishing
tachyonic mode, $e^{\mbox{$- E \,t$}}\psi_{0} + \psi_{1}$, that parameterizes a
tunneling coherent destruction. The non-classical nature of the symmetry
breaking dynamics is recreated in terms of the single particle quantum
mechanics of $1$-dim DW potentials.
