A few hundred optimized non-orthogonal Slater determinants achieve lower variational energies than CCSD(T) for several molecules in double-zeta basis via an exact iterative orbital optimization and fourth-power scaling tensor contraction.
Fukutome, Theory of resonating quantum fluctuations in a fermion system: Resonating hartree-fock approxima- 8 tion, Progress of Theoretical Physics80, 417–432 (1988)
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Precise Quantum Chemistry calculations with few Slater Determinants
A few hundred optimized non-orthogonal Slater determinants achieve lower variational energies than CCSD(T) for several molecules in double-zeta basis via an exact iterative orbital optimization and fourth-power scaling tensor contraction.