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We study the interplay of Klein tunneling (= interband tunneling) betweenn-doped and p-doped regions in graphene and Andreev reflection (= electron-holeconversion) at a superconducting electrode. The tunneling conductance of ann-p-n junction initially increases upon lowering the temperature, while thecoherence time of the electron-hole pairs is still less than their lifetime,but then drops back again when the coherence time exceeds the lifetime. Thisreentrance effect, known from diffusive conductors and ballistic quantum dots,provides a method to detect phase coherent Klein tunneling of electron-holepairs.

Reentrance effect in a graphene n-p-n junction coupled to a superconductor