Title

Three routes to the exact asymptotics for the one-dimensional quantum walk

Authors

Authors

H. A. Carteret; M. E. H. Ismail;B. Richmond

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

J. Phys. A-Math. Gen.

Keywords

Physics, Multidisciplinary; Physics, Mathematical

Abstract

We demonstrate an alternative method for calculating the asymptotic behaviour of the discrete one-coin quantum walk on the infinite line, via the Jacobi polynomials that arise in the path-integral representation. We calculate the asymptotics using a method that is significantly easier to use than the Darboux method. It also provides a single integral representation for the wavefunction that works over the full range of positions, n, including throughout the transitional range where the behaviour changes from oscillatory to exponential. Previous analyses of this system have run into difficulties in the transitional range, because the approximations on which they were based break down here. The fact that there are two different kinds of approach to this problem (path integral versus Schrodinger wave mechanics) is ultimately a manifestation of the equivalence between the path-integral formulation of quantum mechanics and the original formulation developed in the 1920s. We also discuss how and why our approach is related to the two methods that have already been used to analyse these systems.

Journal Title

Journal of Physics a-Mathematical and General

Volume

213

Issue/Number

33

Publication Date

1-1-2003

Document Type

Article

Language

English

First Page

8775

Last Page

8795

WOS Identifier

WOS:000186461900001

ISSN

0305-4470

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