ADIABATIC MODULATION OF A SUPERCONDUCTING QUANTUM INTERFERENCE DEVICE(SQUID) RING BY AN ELECTROMAGNETIC-FIELD

In this paper we consider the modulation of a SQUID ring (a Josephson weak link enclosed by a thick superconducting ring) by an external ele ctromagnetic (em) held for the case where the ring remains adiabatical ly in its ground state. We demonstrate that very good agreement can be found between experimental modulation data and the results predicted theoretically by solving the time-dependent Schrodinger equation for t he ring-em-field system. We also show that the nan-linear dynamical co upling between the ring and an external resonant circuit can influence the exact form of the modulation. Again we find consistent agreement between experiment and theory.