$\mathsf{QMA}$ Lower Bounds for Approximate Counting

William Kretschmer

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arXiv · 1902.02398

$\mathsf{QMA}$ Lower Bounds for Approximate Counting

William Kretschmer

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Abstract

We prove a query complexity lower bound for $\mathsf{QMA}$ protocols that solve approximate counting: estimating the size of a set given a membership oracle. This gives rise to an oracle $A$ such that $\mathsf{SBP}^A \not\subset \mathsf{QMA}^A$, resolving an open problem of Aaronson [2]. Our proof uses the polynomial method to derive a lower bound for the $\mathsf{SBQP}$ query complexity of the $\mathsf{AND}$ of two approximate counting instances. We use Laurent polynomials as a tool in our proof, showing that the "Laurent polynomial method" can be useful even for problems involving ordinary polynomials.

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BibTeX RIS

William Kretschmer. 2019-02-06. $\mathsf{QMA}$ Lower Bounds for Approximate Counting. https://arxiv.org/abs/1902.02398

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