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• W2125022823 abstract "We discuss spreading estimates for dynamical systems given by the iteration of an extended CMV matrix. Using a connection due to Cantero--Grunbaum--Moral--Velazquez, this enables us to study spreading rates for quantum walks in one spatial dimension. We prove several general results which establish quantitative upper and lower bounds on the spreading of a quantum walk in terms of estimates on a pair of associated matrix cocycles. To demonstrate the power and utility of these methods, we apply them to several concrete cases of interest. In the case where the coins are distributed according to an element of the Fibonacci subshift, we are able to rather completely describe the dynamics in a particular asymptotic regime. As a pleasant consequence, this supplies the first concrete example of a quantum walk with anomalous transport, to the best of our knowldege. We also prove ballistic transport for a quantum walk whose coins are periodically distributed." @default.
• W2125022823 created "2016-06-24" @default.
• W2125022823 creator A5012762299 @default.
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• W2125022823 date "2015-05-27" @default.
• W2125022823 modified "2023-09-23" @default.
• W2125022823 title "Spreading Estimates for Quantum Walks on the Integer Lattice via Power-Law Bounds on Transfer Matrices" @default.
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