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arXiv 2008.11998quant-ph
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精确单查询量子算法的特征(II):对于部分函数

Characterization of exact one-query quantum algorithms (ii): for partial functions

Zekun Ye, Lvzhou Li

摘要:

查询模型(或黑箱模型)已经引起了经典计算和量子计算界的广泛关注。通常情况下,量子优势是通过提出一个量子算法,有一个更好的查询复杂度比它的经典同行。例如,著名的量子算法包括Deutsch-Jozsa算法、Simon算法和Grover算法,从查询复杂度的角度来看,都显示出量子计算相当大的优势。最近,我们已经考虑在(物理修订版A。{\bf 101},02232(2020))问题:什么函数可以通过精确的单查询量子算法计算?这个问题已经解决了全部布尔函数,但仍然开放的部分布尔函数。因此,在本文中,我们继续通过给出几个充分必要条件来描述部分布尔函数的精确单查询量子算法的计算能力。在这些条件下,我们构造了一些新的函数,这些函数可以用单查询量子算法精确计算,但与已知的函数有本质的区别。注意,在我们的工作之前,可以通过精确单查询量子算法计算的已知函数都是对称函数,而本文中构造的函数通常是不对称的。

英文摘要:

The query model (or black-box model) has attracted much attention from the communities of both classical and quantum computing. Usually, quantum advantages are revealed by presenting a quantum algorithm that has a better query complexity than its classical counterpart. For example, the well-known quantum algorithms including Deutsch-Jozsa algorithm, Simon algorithm and Grover algorithm all show a considerable advantage of quantum computing from the viewpoint of query complexity. Recently we have considered in (Phys. Rev. A. {\bf 101}, 02232 (2020)) the problem: what functions can be computed by an exact one-query quantum algorithm? This problem has been addressed for total Boolean functions but still open for partial Boolean functions. Thus, in this paper we continue to characterize the computational power of exact one-query quantum algorithms for partial Boolean functions by giving several necessary and sufficient conditions. By these conditions, we construct some new functions that can be computed exactly by one-query quantum algorithms but have essential difference from the already known ones. Note that before our work, the known functions that can be computed by exact one-query quantum algorithms are all symmetric functions, whereas the ones constructed in this papers are generally asymmetric.

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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