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- W3201437871 abstract "We study a position-dependent discrete-time quantum walk (QW) in one dimension, whose time-evolution operator is built up from two coin operators which are distinguished by phase factors from $xgeq0$ and $xleq-1$. We call the QW the {it complete two-phase QW} to discern from the two-phase QW with one defectcite{endosan,maman}. Because of its localization properties, the two-phase QWs can be considered as an ideal mathematical model of topological insulators which are novel quantum states of matter characterized by topological invariants. Employing the complete two-phase QW, we present the stationary measure, and two kinds of limit theorems concerning {it localization} and the {it ballistic spreading}, which are the characteristic behaviors in the long-time limit of discrete-time QWs in one dimension. As a consequence, we obtain the mathematical expression of the whole picture of the asymptotic behavior of the walker, including dependences on initial states, in the long-time limit. We also clarify relevant symmetries, which are essential for topological insulators, of the complete two-phase QW, and then derive the topological invariant. Having established both mathematical rigorous results and the topological invariant of the complete two-phase QW, we provide solid arguments to understand localization of QWs in term of topological invariant. Furthermore, by applying a concept of {it topological protections}, we clarify that localization of the two-phase QW with one defect, studied in the previous workcite{endosan}, can be related to localization of the complete two-phase QW under symmetry preserving perturbations." @default.
- W3201437871 created "2021-09-27" @default.
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- W3201437871 date "2015-11-13" @default.
- W3201437871 modified "2023-09-24" @default.
- W3201437871 title "Relation between two-phase quantum walks and the topological invariant" @default.
- W3201437871 doi "https://doi.org/10.18880/00014026" @default.
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