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QMA has perfect completeness

Sabee Grewal, Dorian Rudolph

quant-pharXiv:2609.13032

Abstract

We prove QMA = QMA1, i.e., every quantum Merlin-Arthur proof system can be made perfectly complete. Our construction uses only Hadamard, Toffoli, and X gates, yielding a universal gate set for QMA1. As a consequence, quantum 3-SAT is QMA-complete. The construction relativizes to classical oracles, so known classical-oracle separations of QMA from QCMA extend to QMA1.

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