QMA is the class of languages that can be decided by an efficient quantum verifier given a quantum witness, whereas QCMA is the class of such languages where the efficient quantum verifier only is given a classical witness. A challenging fundamental goal in quantum query complexity is to find a classical oracle separation for these classes. In this work, we offer a new approach towards proving such a separation that is qualitatively different than prior work, and show that our approach is sound assuming a natural statistical conjecture which may have other applications to quantum query complexity lower bounds.
@InProceedings{zhandry:LIPIcs.ITCS.2025.95, author = {Zhandry, Mark}, title = {{Toward Separating QMA from QCMA with a Classical Oracle}}, booktitle = {16th Innovations in Theoretical Computer Science Conference (ITCS 2025)}, pages = {95:1--95:19}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-361-4}, ISSN = {1868-8969}, year = {2025}, volume = {325}, editor = {Meka, Raghu}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ITCS.2025.95}, URN = {urn:nbn:de:0030-drops-227230}, doi = {10.4230/LIPIcs.ITCS.2025.95}, annote = {Keywords: Quantum, Oracle Separations, QMA, QCMA} }
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