Localization of quantum walks induced by recurrence properties of random walks

Etsuo Segawa

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We study a quantum walk (QW) whose time evolution is induced by a random walk (RW) first introduced by Szegedy (2004). We focus on a relation between recurrent properties of the RW and localization of the corresponding QW. We find the following two fundamental derivations of localization of the QW. The first one is the set of all the l2 summable eigenvectors of the corresponding RW. The second one is the orthogonal complement, whose eigenvalues are ±1, of the subspace induced by the RW. In particular, as a consequence, for an infinite half line, we show that localization of the QW can be ensured by the positive recurrence of the corresponding RWs, and also that the existence of only one self loop affects localization properties.

Original languageEnglish
Pages (from-to)1583-1590
Number of pages8
JournalJournal of Computational and Theoretical Nanoscience
Volume10
Issue number7
DOIs
Publication statusPublished - 2013 Jul 1

Keywords

  • Localization
  • Quantum Walk
  • Random Walk
  • Recurrence Property

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Computational Mathematics
  • Electrical and Electronic Engineering

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