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- Title
Weak Limit Theorem of a Two-phase Quantum Walk with One Defect.
- Authors
Shimpei ENDO; Takako ENDO; Norio KONNO; Etsuo SEGAWA; Masato TAKEI
- Abstract
We attempt to analyze a one-dimensional space-inhomogeneous quantum walk (QW) with one defect at the origin, which has two different quantum coins in positive and negative parts. We call the QW ''the two-phase QW with one defect'', which we treated concerning localization theorems [7]. The two-phase QW with one defect has been expected to be a mathematical model of topological insulator [15] which is an intense issue both theoretically and experimentally [3, 5, 11]. In this paper, we derive the weak limit theorem describing the ballistic spreading, and as a result, we obtain the mathematical expression of the whole picture of the asymptotic behavior. Our approach is based mainly on the generating function of the weight of the passages. We emphasize that the timeaveraged limit measure is symmetric for the origin [7], however, the weak limit measure is asymmetric, which implies that the weak limit theorem represents the asymmetry of the probability distribution.
- Subjects
QUANTUM defect theory; GENERATING functions; DISTRIBUTION (Economic theory); STOCHASTIC convergence; TOPOLOGICAL insulators
- Publication
Interdisciplinary Information Sciences, 2016, Vol 22, Issue 1, p17
- ISSN
1340-9050
- Publication type
Article
- DOI
10.4036/iis.2016.R.01