Quantum walk search on Johnson graphs

Quantum walk search on Johnson graphs
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约翰逊图上的量子行走搜索

DOI:
10.1088/1751-8113/49/19/195303
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发表时间:
2016
期刊:
Journal of Physics A: Mathematical and Theoretical
影响因子:
--
通讯作者:
T. G. Wong
T. G. Wong
中科院分区:
--
文献类型:
--
作者:
T. G. Wong

文献摘要

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约翰逊图J(n,k)由n个符号定义,其中顶点是符号的k元子集,如果顶点之间只有一个符号不同,则它们是相邻的。特别地,J(n,1)是完全图Kn,J(n,2)是强正则三角图Tn,已知这两者都支持通过连续时间量子行走的快速空间搜索。在本文中,我们证明了J(n,3),这是n-四面体图,也支持快速搜索。在这个过程中,我们表明,一个变化的基础是需要退化微扰理论,以准确地描述动力学。这种方法也可以应用于k固定的一般约翰逊图J(n,k)。
The Johnson graph J ( n , k ) is defined by n symbols, where vertices are k-element subsets of the symbols, and vertices are adjacent if they differ in exactly one symbol. In particular, J ( n , 1 ) is the complete graph Kn, and J ( n , 2 ) is the strongly regular triangular graph Tn, both of which are known to support fast spatial search by continuous-time quantum walk. In this paper, we prove that J ( n , 3 ) , which is the n-tetrahedral graph, also supports fast search. In the process, we show that a change of basis is needed for degenerate perturbation theory to accurately describe the dynamics. This method can also be applied to general Johnson graphs J ( n , k ) with fixed k.