The Guided Local Hamiltonian problem for stoquastic Hamiltonians is promise BPP-hard (even 2-local on lattices), BQP-hard under fixed local constraints, and admits a deterministic classical approximation algorithm when promise gap, overlap, and spectral gap are constant with constant-depth local-pre
Qma with subset state witnesses,
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The Guided Local Hamiltonian Problem for Stoquastic Hamiltonians
The Guided Local Hamiltonian problem for stoquastic Hamiltonians is promise BPP-hard (even 2-local on lattices), BQP-hard under fixed local constraints, and admits a deterministic classical approximation algorithm when promise gap, overlap, and spectral gap are constant with constant-depth local-pre