Measurement of inductive coupling between coplanar superconducting transmission lines

By measuring forward and backward coupling between superconducting coplanar transmission lines at various temperatures, we determined the dependence of inductive coupling on the London penetration depth. If the transmission lines are separated by a shielding ground line, inductive coupling increases with increasing penetration depth. If the shielding line is damaged or absent, there is a slight decrease. Since both effects are in the percentage range, they can only be observed in the forward-coupled noise signal. The backward coupled noise is nearly temperature independent. We measured inductive coupling factors between 6 and 8% on 10- and 5-/spl mu/m-wide transmission lines, which are separated by a shielding ground line. Excellent agreement was obtained between measurements and FEM simulations.