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We present a simple, robust and highly efficient method for optimizing allparameters of many-body wave functions in quantum Monte Carlo calculations,applicable to continuum systems and lattice models. Based on a strongzero-variance principle, diagonalization of the Hamiltonian matrix in the spacespanned by the wav e function and its derivatives determines the optimalparameters. It systematically reduces the fixed-node error, as demonstrated bythe calculation of the binding energy of the small but challenging C$_2$molecule to the experimental accuracy of 0.02 eV

Erratum: Alleviation of the Fermion-Sign Problem by Optimization of Many-Body Wave Functions [Phys. Rev. Lett.98, 110201 (2007)]