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arXiv 1104.4468quant-phcs.CC
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量子查询复杂度的强直积定理

A strong direct product theorem for quantum query complexity

Troy Lee, Jérémie Roland

摘要:

我们证明了量子查询复杂度满足一个强直积定理。这意味着计算函数的$k$副本所需的量子查询少于计算函数的一个副本所需的量子查询的$k$倍,这意味着在$k$中总体成功概率将呈指数级小。对于一个布尔函数$f$,我们还显示了一个异或引理--计算奇偶校验的$k$副本的$f$小于$k$倍的查询需要一个副本意味着随机猜测的优势将是指数小。我们这样做的乘法对手的方法,它本身满足一个强直积定理,总是至少一样大的加法对手的方法,这是已知的量子查询复杂性的特征。

英文摘要:

We show that quantum query complexity satisfies a strong direct product theorem. This means that computing $k$ copies of a function with less than $k$ times the quantum queries needed to compute one copy of the function implies that the overall success probability will be exponentially small in $k$. For a boolean function $f$ we also show an XOR lemma---computing the parity of $k$ copies of $f$ with less than $k$ times the queries needed for one copy implies that the advantage over random guessing will be exponentially small. We do this by showing that the multiplicative adversary method, which inherently satisfies a strong direct product theorem, is always at least as large as the additive adversary method, which is known to characterize quantum query complexity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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