Operator optimization is essential for accurately determining QCD eigenstates in lattice calculations, especially for multi-hadron systems where the spectrum is far denser than for single-hadron states. In this talk, I will present a novel way to systematically construct optimized interpolating operators strongly coupled to QCD two-particle states, which is achieved by incorporating inter-hadron spatial wavefunctions. To efficiently implement these operators in lattice QCD, we introduce a novel quark smearing technique utilizing noise vectors. As a demonstration, we apply this approach to the $\Omega_{ccc}\Omega_{ccc}$ system, and successfully resolve distinct eigenstates separated by only $\sim 5$ MeV near the threshold $2m_{\Omega_{ccc}} \simeq 9700$ MeV. This exceptional resolving power opens new possibilities for studies of a wide range of hadronic systems in QCD.
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