Phase locking in a multijunction superconducting loop

Abstract

Mutual phase locking of Josephson junctions in a multijunction superconducting loop (MSL) was investigated both theoretically and experimentally. The theoretical analysis predicts the existence of phase-locked states, where the circulating current in the loop serves for phase locking between junctions. The basic operating principles of a MSL were studied experimentally using high-TC bicrystal Josephson junctions. The enhancement of phase locking stability with respect to series arrays is reported.