  We propose a three-terminal structure to probe robust signatures of Majorana
zero modes. This structure consists of a quantum dot coupled to the normal
metal, s-wave superconducting and Majorana Y-junction leads. The zero-bias
differential conductance at zero temperature of the normal-metal lead peaks at
$2e^{2}/h$, which will be deflected after Majorana braiding. This quantized
conductance can entirely arise from the Majorana-induced crossed Andreev
reflection, protected by the energy gap of the superconducting lead. We find
that the effect of thermal broadening is significantly suppressed when the dot
is on resonance. In the case that the energy level of the quantum dot is much
larger than the superconducting gap, tunneling processes are dominated by
Majorana-induced crossed Andreev reflection. Particularly, a novel kind of
crossed Andreev reflection equivalent to the splitting of charge quanta $3e$
occurs after Majorana braiding.
