Quantum search for multiple items using parallel queries

Quantum search for multiple items using parallel queries
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使用并行查询对多个项目进行量子搜索

DOI:
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发表时间:
2004
期刊:
影响因子:
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通讯作者:
J. Radhakrishnan
J. Radhakrishnan
中科院分区:
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文献类型:
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作者:
Lov K. Grover;J. Radhakrishnan

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在量子数据库搜索问题中,我们需要在数据库中搜索一个项目。在本文中,我们考虑了此问题的概括,在该问题中,我们提供了数据库的相同的应对,每个数据库都有N个项目,我们可以并行查询。然后,给定k项,我们需要确定存储这些项目的位置。我们表明,此任务的任何量子算法都必须执行Omega(SQRT {NK/D Min {D,K}})并行查询。我们还设计了一种算法,其性能属于该下限的因子O(log d)。
In the quantum database search problem we are required to search for an item in a database. In this paper, we consider a generalization of this problem, where we are provided d identical copes of a database each with N items which we can query in parallel. Then, given k items, we are required to determine the locations where these items are stored. We show that any quantum algorithm for this task must perform Omega(sqrt{Nk/d min{d,k}}) parallel queries. We also design an algorithm whose performance comes within a factor O(log d) of this lower bound.