Generalizes eVQE to multiple coupled electronic states using a quantum-implementable basis transformation and algebraic optimization, demonstrated on the first three states of H4+.
Here, we used as an ansatz the Trotterized – also called disen- tangled – ‘generalized unitary coupled-cluster single double’ (GUCCSD) [77]
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Unified adiabatic and diabatic excited-state description via the ensemble-variational quantum eigensolver
Generalizes eVQE to multiple coupled electronic states using a quantum-implementable basis transformation and algebraic optimization, demonstrated on the first three states of H4+.