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arXiv 1004.5409quant-phcs.CC
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绝热量子计算:热心者和怀疑者的观点

Adiabatic quantum computation: Enthusiast and Sceptic's perspectives

Zhenwei Cao, Alexander Elgart

摘要:

爱好者的观点:我们分析了AQC对于具有任意初始Hamilton量$H_I$的小秩问题Hamilton量$H_F$的有效性。我们证明了对于一般的$H_I$的运行时间不能小于$O(\sqrt N)$,其中$N$是希尔伯特空间的一个维度。我们还构造了一个显式的$H_I$,其运行时间确实是$O(\sqrt N)$。我们的算法可以用来解决标记项目数未知的非结构化搜索问题。怀疑论者的观点:我们表明,对于一个强大的设备,这样的$H_F$的运行时间不能比$O(N/\ln N)$小得多。

英文摘要:

Enthusiast's perspective: We analyze the effectiveness of AQC for a small rank problem Hamiltonian $H_F$ with the arbitrary initial Hamiltonian $H_I$. We prove that for the generic $H_I$ the running time cannot be smaller than $O(\sqrt N)$, where $N$ is a dimension of the Hilbert space. We also construct an explicit $H_I$ for which the running time is indeed $O(\sqrt N)$. Our algorithm can be used to solve the unstructured search problem with the unknown number of marked items. Sceptic's perspective: We show that for a robust device, the running time for such $H_F$ cannot be much smaller than $O(N/\ln N)$.

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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