Reduction in inductance of an integrated SQUID

Abstract In an integrated-SQUID, a change in its inductance caused by a superconductor placed in proximity has been measured to design the inductance accurately. The measured inductance of the SQUID is reduced by the existence of the superconductor. The measured inductance is explained well by numerical results based on a model taking account of flux coupling between the superconductor and the SQUID. The origin of the reduction is found to be mirror current that flows in the superconductor by the coupling.