  We study the superfluid density of hard-core bosons on quasi-one-dimensional
lattices using the quantum Monte Carlo method. Because of phase slippage, the
superfluid density drops quickly to zero at finite temperatures with increasing
the system length $\ell$ and the superfluid transition temperature is zero in
one spatial dimension and also in quasi-one dimension in the limit of
$\ell\rightarrow\infty$. We calculate the superfluid density of a model where
no phase slippage is allowed and show that the superfluid density remains
finite at finite temperatures even in the one-dimensional limit. We also
discuss how finite superfluid density can be observed in a
quasi-one-dimensional system using a torsional oscillator.
