Higher standard voltage generated by multiple Josephson junctions

Abstract
Preliminary experiments have been performed to obtain a higher standard volt with ten tunnel junctions connected in series. A bias microwave source is used. The microwave power at each junction has to be controlled as closely as possible. Parameters and conditions for the microwave coupling are discussed. The voltage obtained is 55.5 mV at present, but no serious obstacles can be seen for obtaining voltages higher than 100 mV.

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