  The entanglement of coherently split electron-hole pairs in an electronic
conductor is typically not considered accessible due to particle number
conservation and fermionic super-selection rules. We demonstrate here that
current cross-correlation measurements at the outputs of an electronic
Mach-Zehnder interferometer can nevertheless provide a robust witness of
electron-hole entanglement. Specifically, we consider neutral excitations
generated by modulating the transmission of an unbiased quantum point contact
periodically in time. For an optimized modulation profile, an entangled state
with one positively-charged leviton (a hole) and one negatively-charged leviton
(an electron) gets delocalized over the two paths of the interferometer and is
detected at the output arms. We evaluate the influence of finite electronic
temperatures and dephasing corresponding to recent experiments.
