Lackadaisical quantum walks on 2D grids with multiple marked vertices

• URL: http://arxiv.org/abs/2104.09955v1
• Date: Tue, 20 Apr 2021 13:33:16 GMT
• Title: Lackadaisical quantum walks on 2D grids with multiple marked vertices
• Authors: Nikolajs Nahimovs and Raqueline A. M. Santos
• Abstract summary: Lackadaisical quantum walk (LQW) is a quantum analog of a classical lazy walk. We numerically study search by LQW for different types of 2D grids -- triangular, rectangular and honeycomb.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Lackadaisical quantum walk (LQW) is a quantum analog of a classical lazy walk, where each vertex has a self-loop of weight $l$. For a regular $\sqrt{N}\times\sqrt{N}$ 2D grid LQW can find a single marked vertex with $O(1)$ probability in $O(\sqrt{N\log N})$ steps using $l = d/N$, where $d$ is the degree of the vertices of the grid. For multiple marked vertices, however, $l = d/N$ is not optimal as the success probability decreases with the increase of the number of marked vertices. In this paper, we numerically study search by LQW for different types of 2D grids -- triangular, rectangular and honeycomb -- with multiple marked vertices. We show that in all cases the weight $l = m\cdot d/N$, where $m$ is the number of marked vertices, still leads to $O(1)$ success probability.

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