Time evolution of continuous-time quantum walks on dynamical percolation graphs

Darázs, Zoltán and Kiss, Tamás (2013) Time evolution of continuous-time quantum walks on dynamical percolation graphs. JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL, 46 (37). ISSN 1751-8113

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Abstract

We study the time evolution of continuous-time quantum walks on randomly changing graphs. At certain moments edges of the graph appear or disappear with a given probability as in percolation. We treat this problem in a strong noise limit. We focus on the case when the time interval between subsequent changes of the graph tends to zero. We derive explicit formulae for the general evolution in this limit. We find that the percolation in this limit causes an effective time rescaling. Independently of the graph and the initial state of the walk, the time is rescaled by the probability of keeping an edge. Both the individual trajectories for a single system and average properties with a superoperator formalism are discussed. We give an analytical proof for our theorem and we also present results from numerical simulations of the phenomena for different graphs. We also analyze the effect of finite step-size on the evolution.

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