Table 1 Comparison of the calculation methods for S0 and S1.

From: Excited state calculations using variational quantum eigensolver with spin-restricted ansätze and automatically-adjusted constraints

Ansatz

Geometry

S0

S1

Heuristic

FC

VQE

VQD (C2(θ), β > 0)

CI

VQD (C2(θ), β = 0)

VQD (C2(θ), β > 0)

Spin-restricted

Any

VQE

VQD (C1(θ), β > 0)

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