MULTITERMINAL SQUID CONTROLLED BY THE TRANSPORT CURRENT

A theory is offered for a multi-terminal SQUID (MTS), i.e., a superconducting ring interrupted with a Josephson multi-terminal junction, The behaviour of the MTS which is governed by the two independent control parameters, the transport current and the applied magnetic flux, is described. The steady state domain and the critical current in the transport circuit as a function of the external magnetic flux in the ring is obtained. The total magnetic flux in the ring is a multi-valued function from the applied magnetic flux for all values of the self-inductance of the ring. The MTS presents a system in which the structure of macroscopic quantum states can be transformed by the current through the current-driven Josephson junction as well as by the external magnetic field.