Using computational techniques, it is shown that pairing is a robust property
of hole doped antiferromagnetic (AF) insulators. In one dimension (1D) and for
two-leg ladder systems, a BCS-like variational wave function with long-bond
spin-singlets and a Jastrow factor provides an accurate representation of the
ground state of the t-J model, even though strong quantum fluctuations destroy
the off-diagonal superconducting (SC) long-range order in this case. However,
in two dimensions (2D) it is argued -- and numerically confirmed using several
techniques, especially quantum Monte Carlo (QMC) -- that quantum fluctuations
are not strong enough to suppress superconductivity.Comment: 4 pages, 5 figure