  The entanglement Hamiltonian (EH) provides the most comprehensive
characterization of bipartite entanglement in many-body quantum systems. Ground
states of local Hamiltonians inherit this locality, resulting in EHs that are
dominated by local, few-body terms. Unfortunately, in non-equilibrium
situations, analytic results are rare and largely confined to continuous field
theories, which fail to accurately describe microscopic models. To address this
gap, we present an exact analytic result for the EH following a generic quantum
quench in non-interacting fermionic models. This derivation adapts the
celebrated quasiparticle picture to the EH, providing detailed insights into
its physical properties. The resulting analytic formula serves as a foundation
for engineering EHs in quantum optics experiments.
