  By numerically solving the Schr\"oedinger equation for small sizes we
investigate the quantum critical point of the infinite-range Ising spin glass
in a transverse field at zero temperature. Despite its simplicity the method
yields accurate information on the value of the critical field and critical
exponents. We obtain $\Gamma_c=1.47\pm 0.01$ and check that exponents are in
agreement with analytical approaches.
