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arXiv quant-ph/0302112quant-phmath.RT
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二面角隐子群问题的次指数时间量子算法

A subexponential-time quantum algorithm for the dihedral hidden subgroup problem

Greg Kuperberg

摘要:

提出了一种求解具有时间和查询复杂度的二面角隐子群问题的量子算法$O(\exp(C\sqrt{\log N}))$ .在这个问题中,预言机计算二面体群$D_N$上的函数$f$,该函数在$D_N$中的隐藏反射下不变。相比之下,DHSP的经典查询复杂度是$O(\sqrt{N})$。该算法也适用于任意可生成阿贝尔群的隐移位问题。该算法与其他隐子群问题一样,首先对群进行量子特征变换。然后对$D_N$的不可约表示进行张量化,并提取和项,得到目标表示.最后,对目标表示的状态层析成像揭示了隐藏的子群。

英文摘要:

We present a quantum algorithm for the dihedral hidden subgroup problem with time and query complexity $O(\exp(C\sqrt{\log N}))$. In this problem an oracle computes a function $f$ on the dihedral group $D_N$ which is invariant under a hidden reflection in $D_N$. By contrast the classical query complexity of DHSP is $O(\sqrt{N})$. The algorithm also applies to the hidden shift problem for an arbitrary finitely generated abelian group. The algorithm begins with the quantum character transform on the group, just as for other hidden subgroup problems. Then it tensors irreducible representations of $D_N$ and extracts summands to obtain target representations. Finally, state tomography on the target representations reveals the hidden subgroup.

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