  We calculate the off-diagonal density matrix of the homogeneous electron gas
at zero temperature using unbiased Reptation Monte Carlo for various densities
and extrapolate the momentum distribution, and the kinetic and potential
energies to the thermodynamic limit. Our results on the renormalization factor
allows us to validate approximate G_0W_0 calculations concerning quasiparticle
properties over a broad density region (1 <= r_s <= 10) and show that near the
Fermi surface, vertex corrections and self-consistency aspects almost cancel
each other out.
