Classical vs Quantum Advice under Classically-Accessible Oracle

It is a long-standing open question to construct a classical oracle relative to which BQP/qpoly $\neq$ BQP/poly or QMA $\neq$ QCMA. In this paper, we construct classically-accessible classical oracles relative to which BQP/qpoly $\neq$ BQP/poly. Here, classically-accessible classical oracles are oracles that can be accessed only classically even for quantum algorithms. Based on a similar technique, we also show an alternative proof for separation of QMA and QCMA relative to a distributional quantumly-accessible classical oracles, which was recently shown by Natarajan and Nirkhe.