LIMITS TO THE OBSERVATION OF COHERENT OSCILLATIONS IN A SQUID RING

Using the quantum mechanical, lumped component model of a SQUID ring w e compute the onset of tunnelling and macroscopic superposition behavi our in the parameter space of the ring. In addition, we make a quantit ative estimate of the stability required in the environmental flux to sustain a Superposition state. Both these features are of crucial impo rtance to the realisation of experiments aimed at revealing such behav iour.