Study of junction and bias parameters in readout of phase qubits

► Exact numerical solution of Ginzburg-Landau equation using a new perturbative approach. ► Exact calculation of tunneling rates for the first time. ► Definition and calculation of a new figure of merit for operation of qubits. ► Optimization of qubit design. ► Study of the effects of gap width, bias current, cross sectional area, as well as magnetic field.