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arXiv 1801.02809quant-ph
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多相反转态的广义Grover算法

Generalized Grover's algorithm for multiple phase inversion states

Tim Byrnes, Gary Forster, Louis Tessler

摘要:

Grover算法是一种量子搜索算法,它通过重复应用Grover算子和Oracle来进行,直到状态演化到目标状态之一。在该算法的标准版本中,Grover运算符仅在一个状态上反转符号。在这里,我们提供了一个精确的解决方案,执行格罗弗的搜索,格罗弗运营商反转N个国家的标志的问题。我们显示的基本结构的广义哈密顿量的本征谱,并推导出一个适当的初始状态进行格罗弗演化。这允许我们使用量子相位估计算法来解决这种广义情况下的搜索问题,完全绕过Grover算法。我们得到这种情况下的时间复杂度为$\sqrt(D/M^α)$,其中D是搜索空间维度,M是目标状态的数量,并且$α$ ~ 1,这接近于最优缩放。

英文摘要:

Grover's algorithm is a quantum search algorithm that proceeds by repeated applications of the Grover operator and the Oracle until the state evolves to one of the target states. In the standard version of the algorithm, the Grover operator inverts the sign on only one state. Here we provide an exact solution to the problem of performing Grover's search where the Grover operator inverts the sign on N states. We show the underlying structure in terms of the eigenspectrum of the generalized Hamiltonian, and derive an appropriate initial state to perform the Grover evolution. This allows us to use the quantum phase estimation algorithm to solve the search problem in this generalized case, completely bypassing the Grover algorithm altogether. We obtain a time complexity of this case of $\sqrt(D/M^α)$ where D is the search space dimension, M is the number of target states, and $α$ ~ 1, which is close to the optimal scaling.

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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