  We propose that, if the pseudogap state in the cuprate superconductors can be
described in terms of the phase-incoherent preformed pairs, there should exist
Andreev reflection from these pairs even above the superconducting transition
temperature, $T_c$. After giving qualitative arguments for this effect, we
present more quantitative calculations based on the Bogoliubov--de Gennes
equation. Experimental observations of the effects of Andreev reflections above
$T_c$---such as an enhanced tunneling conductance below the gap along the
copper oxide plane---could provide unambiguous evidence for the preformed pairs
in the pseudogap state.

Superconductivity;Mesoscale and Nanoscale Physics