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Projection Monte Carlo calculations of lattice Chiral Effective Field Theorysuffer from sign oscillations to a varying degree dependent on the number ofprotons and neutrons. Hence, such studies have hitherto been concentrated onnuclei with equal numbers of protons and neutrons, and especially on the alphanuclei where the sign oscillations are smallest. Here, we introduce the"symmetry-sign extrapolation" method, which allows us to use the approximateWigner SU(4) symmetry of the nuclear interaction to systematically extend theProjection Monte Carlo calculations to nuclear systems where the sign problemis severe. We benchmark this method by calculating the ground-state energies ofthe $^{12}$C, $^6$He and $^6$Be nuclei, and discuss its potential for studiesof neutron-rich halo nuclei and asymmetric nuclear matter.

Nuclear Lattice Simulations using Symmetry-Sign Extrapolation