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We investigate the parametric electron pumping of a double barrier structurein the presence of a superconducting lead. The parametric pumping isfacilitated by cyclic variation of the barrier heights $x_1$ and $x_2$ of thebarriers. In the weak coupling regime, there exists a resonance line in theparameter space $(x_1,x_2)$ so that the energy of the quasi-bound state is inline with the incoming Fermi energy. Levinson et al found recently that thepumped charge for each pumping cycle is quantized with $Q=2e$ for normalstructure when the pumping contour encircles the resonance line. In thepresence of a superconducting lead, we find that the pumped charge is quantizedwith the value $2e$

Quantization of adiabatic pumped charge in the presence of superconducting lead