Phase-locking Josephson junctions arrays

We demonstrate that a large area Josephson junction oscillating in the flux on oscillator mode can be synchronized to other large junctions and simulta neously pump, by emitted radiation, a small area junction. We study the syn chronization of the oscillations of the long junctions as a function of rel evant experimental parameters such as bias current and stripline coupling c haracteristics. Experimental results obtained on coupled series arrays of J osephson junctions designed on the basis of our calculations are presented. We have fabricated coupled arrays containing each up to 1500 junctions in order to estimate the usefulness of our calculations for voltage standard d evices. (C) 2001 American Institute of Physics.