  We propose a novel spatially inhomogeneous setup for revealing quench-induced
fractionalized excitations in entanglement dynamics. In this quench-probe
setting, the region undergoing a quantum quench is tunnel-coupled to a static
region, the probe.Subsequently, the time-dependent entanglement signatures of a
tunable subset of excitations propagating to the probe are monitored by energy
selectivity. We exemplify the power of this generic approach by identifying a
unique dynamical signature associated with the presence of an isolated Majorana
zero mode in the post-quench Hamiltonian. In this case excitations emitted from
the topological part of the system give rise to a fractionalized jump of
$\log(2)/2$ in the entanglement entropy of the probe. This dynamical effect is
highly sensitive to the localized nature of the Majorana zero mode, but does
not require the preparation of a topological initial state.
