  Topological superconductors give rise to unconventional superconductivity,
which is mainly characterized by the symmetry of the superconducting pairing
amplitude. However, since the symmetry of the superconducting pairing amplitude
is not directly observable, its experimental identification is rather
difficult. In our work, we propose a system, composed of a quantum point
contact and proximity induced s-wave superconductivity at the helical edge of a
two dimensional topological insulator, for which we demonstrate the presence of
odd-frequency pairing and its intimate connection to unambiguous transport
signatures. Notably, our proposal requires no time-reversal symmetry breaking
terms. We discover the domination of crossed Andreev reflection over electron
cotunneling in a wide range of parameter space, which is a quite unusual
transport regime.
