  The electric conductivities in glass phases of three-dimensional (3D)
granular superconductors in magnetic fields are examined based on a quantum
disordered Josephson-junction array. A correct inclusion of the Ohmic
dissipative dynamics leads to glass phases with divergent dc conductivity. In
contrast, with no dissipative term, a metallic response in a glass phase is
obtained irrespective of the range of correlation of quenched disorder, i.e.,
even in the so-called Bose-glass phase with experimentally vanishing
resistivity.
