  Mesoscopic multi-terminal Josephson junctions are novel devices that provide
weak coupling between several bulk superconductors through a common normal
layer. Because of the nonlocal coupling of the superconducting banks, a current
flow between two of the terminals can induce a phase difference and/or current
flow in the other terminals. This "phase dragging" effect is used in designing
a new type of superconducting phase qubit, the basic element of a quantum
computer. Time-reversal symmetry breaking can be achieved by inserting a
pi-phase shifter into the flux loop. Logical operations are done by applying
currents. This removes the necessity for local external magnetic fields to
achieve bistability or controllable operations.
