Nuclear lattice effective field theory (NLEFT) is an efficient ab initio tool for solving nuclear many-body systems using the imaginary-time projection technique, where the preparation of trial states is essential for substantially reducing the computational cost required to achieve the desired numerical precision. It has been challenging in forming optimal multireference trial states using multiple Slater determinants within auxiliary-field-based quantum Monte Carlo frameworks like NLEFT. In this work, we develop a novel sampling method for efficiently incorporating such multireference trial states into NLEFT calculations. We applied the optimized trial state to ${}^7\mathrm{Li}$ and ${}^8\mathrm{Li}$, finding overall improvements in calculated energies, electromagnetic properties, and transitions compared to results obtained without these optimizations. Our approach provides a reliable foundation for accurately simulating nuclear ground and low-lying excited states within the NLEFT framework.

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• Effective field theory
• Ab initio calculations
• Lattice field theory
• Quantum Monte Carlo