StoqMA(2) contains NP via Õ(√n)-qubit unentangled stoquastic proofs (nearly perfect completeness) and is contained in EXP, with ETH-optimal parameters matching a refined BKS Sum-of-Squares bound.
Quantum Merlin--Arthur with an internally separable proof
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The power of unentanglement without destructive interference
StoqMA(2) contains NP via Õ(√n)-qubit unentangled stoquastic proofs (nearly perfect completeness) and is contained in EXP, with ETH-optimal parameters matching a refined BKS Sum-of-Squares bound.