  Majorana fermions are promising building blocks of forthcoming technology in
quantum computing. However, their non-ambiguous identification has remained a
difficult issue because of the concomitant competition with other topologically
trivial fermionic states, which poison their detection in most spectroscopic
probes. By employing numerical and analytical methods, here we show that the
Fano factor tomography is a key distinctive feature of a Majorana bound state,
displaying a spatially constant Poissonian value equal to one. In contrast, the
Fano factor of other trivial fermionic states, like the Yu-Shiba-Rusinov or
Andreev ones, is strongly spatially dependent and exceeds one as a direct
consequence of the local particle-hole symmetry breaking.
