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We study transport properties of two Josephson junctions coupled by anexternal shunt resistance. One of the junction (say, the first) is driven by anunbiased ac current consisting of two harmonics. The device can rectify the accurrent yielding a dc voltage across the first junction. For some values ofcoupling strength, controlled by an external shunt resistance, a dc voltageacross the second junction can be generated. By variation of system parameterslike the relative phase or frequency of two harmonics, one can convenientlymanipulate both voltages with high efficiency, e.g., changing the dc voltagesacross the first and second junctions from positive to negative values and viceversa.

Two coupled Josephson junctions: dc voltage controlled by biharmonic current