In small variational quantum eigensolver problems, high Hamiltonian expressibility helps for superposition-state problems while low expressibility helps for basis-state problems.
Phys Lett A 294(4):258--260
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Hamiltonian Expressibility for Ansatz Selection in Variational Quantum Algorithms
In small variational quantum eigensolver problems, high Hamiltonian expressibility helps for superposition-state problems while low expressibility helps for basis-state problems.