  The paper studies unambiguous discrimination of Fermionic states through
local operations and classical communication (LOCC). In the task of unambiguous
discrimination, no error is tolerated but an inconclusive result is allowed. We
show that contrary to the quantum case, it is not always possible to
distinguish two Fermionic states through LOCC unambiguously with the same
success probability as if global measurements were allowed. Furthermore, we
prove that we can overcome such a limit through an ancillary system made of two
Fermionic modes, independently of the dimension of the system, prepared in a
maximally entangled state: in this case, LOCC protocols achieve the optimal
success probability.
