The dynamic properties of a superconducting quantum interference device (SQUID) containing arrays of Josephson junctions in a superconducting loop, and in particular the case of a four‐junction SQUID, is analyzed theoretically via computer simulations. It is shown that phase locking of Josephson junctions determines the dynamic behavior of the SQUID. In the case of a stable phase‐lock state hysteretic IV curves as well as unusual voltage‐flux dependencies appear. The influence of a small spread in the Josephson junction parameters upon the stability of the phase‐lock state is investigated in parameter space.

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