  We study the differential conductance of a time-reversal symmetric Weyl
semimetal-superconductor (N-S) junction with an s-wave superconducting state.
We find that there exists an extended regime where the zero-bias differential
conductance acquires the universal value $e^{2}/h$ per unit channel,
independent of the pairing and chemical potentials on each side of the
junction, due to a perfect cancellation of Andreev and normal reflection
contributions. This universal conductance can be attributed to the interplay of
the unique spin/orbital-momentum locking and s-wave pairing that couples Weyl
nodes of the same chirality. We expect that the universal conductance can serve
as a robust and distinct signature for time-reversal symmetric Weyl fermions,
and be observed in the recently discovered time-reversal symmetric Weyl
semimetals.

Superconductivity