  Applying three independent techniques, we give numerical evidence for a
finite superfluid density in isotropic hole-doped t--J ladders: We show the
existence of anomalous flux quantization, emphasising the contrasting behaviour
to that found in the `Luttinger liquid' regime stabilised at low electron
densities; We consider the nature of the low-lying excitation modes, finding
the 1-D analog of the superconducting state; And using a density matrix
renormalization group approach, we find long range pairing correlations and
exponentially decaying spin-spin correlations.
