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arXiv quant-ph/0604174quant-ph
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具有最佳样本复杂度的隐子群问题的量子测量

Quantum Measurements for Hidden Subgroup Problems with Optimal Sample Complexity

Masahito Hayashi, Akinori Kawachi, Hirotada Kobayashi

摘要:

隐子群问题的核心问题之一是约束样本复杂度,即,陪集状态的相同样本的数量对于解决该问题是足够和必要的。在本文中,我们提出了一般的范围内的识别和决策版本的隐藏子群问题的样本复杂性。作为一个结果的界限,我们表明,样本的复杂性为决策和识别版本是$Θ(\log|\HH|/\log p)$的候选集$\HH$的隐藏子群的情况下,候选子群具有相同的素数阶$p$,这意味着决策版本至少是硬的识别版本在这种情况下。特别是,它这样做的重要情况下,如二面角和对称隐藏子群问题。此外,通过较好的测量,得到了辨识的上界。这表明,相当好的测量可以识别任何隐藏的子群的任意组与最多$O(\log|\HH|)$样本。

英文摘要:

One of the central issues in the hidden subgroup problem is to bound the sample complexity, i.e., the number of identical samples of coset states sufficient and necessary to solve the problem. In this paper, we present general bounds for the sample complexity of the identification and decision versions of the hidden subgroup problem. As a consequence of the bounds, we show that the sample complexity for both of the decision and identification versions is $Θ(\log|\HH|/\log p)$ for a candidate set $\HH$ of hidden subgroups in the case that the candidate subgroups have the same prime order $p$, which implies that the decision version is at least as hard as the identification version in this case. In particular, it does so for the important instances such as the dihedral and the symmetric hidden subgroup problems. Moreover, the upper bound of the identification is attained by the pretty good measurement. This shows that the pretty good measurement can identify any hidden subgroup of an arbitrary group with at most $O(\log|\HH|)$ samples.

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