  We examine a possible effect of the Lense--Thirring field or gravitational
drag by calculating the fluctuation current through a superconducting ring. The
gravitational drag is induced by a rotating sphere, on top of which the
superconducting ring is placed. The formulation is based on the Landau-Ginzburg
free energy functional of linear form. The resultant fluctuation current is
shown to be greatly enhanced in the vicinity of the transition temperature, and
the current also increases on increasing the winding number of the ring. These
effects would provide a modest step towards magnification of tiny gravity.
