Truncated linear response excitation energies depend on redundant wave function parameters even at the FCI ground state, and constrained state-averaged UCC optimization can reduce this dependence.
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Redundant parameter dependencies in truncated classic and quantum Linear Response and Equation of Motion theory
Truncated linear response excitation energies depend on redundant wave function parameters even at the FCI ground state, and constrained state-averaged UCC optimization can reduce this dependence.