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Topological Majorana fermion (MF) quasiparticles have been recently suggestedto exist in semiconductor quantum wires with proximity inducedsuperconductivity and a Zeeman field. Although the experimentally observed zerobias tunneling peak and a fractional ac-Josephson effect can be taken asnecessary signatures of MFs, neither of them constitutes a sufficient "smokinggun" experiment. Since one pair of Majorana fermions share a singleconventional fermionic degree of freedom, MFs are in a sense fractionalizedexcitations. Based on this fractionalization we propose a tunneling experimentthat furnishes a nearly unique signature of end state MFs in semiconductorquantum wires. In particular, we show that a "teleportation"-like experiment isnot enough to distinguish MFs from pairs of MFs, which are equivalent toconventional zero energy states, but our proposed tunneling experiment, inprinciple, can make this distinction.

A proposal to probe quantum non-locality of Majorana fermions in tunneling experiments