Asymptotic behavior of quantum walks on the line

Details Asymptotic behavior of quantum walks on the line Asymptotic behavior of quantum walks on the line

2011-08-09

arxiv.org/abs/1108.1878v1

Mathematics

Probability

32 pages, 1 figure

Scientific paper

This paper gives various asymptotic formulae for the transition probability associated with discrete time quantum walks on the real line. The formulae depend heavily on the `normalized' position of the walk. When the position is in the support of the weak-limit distribution obtained by Konno, one observes, in addition to the limit distribution itself, an oscillating phenomenon in the leading term of the asymptotic formula. When the position lies outside of the support, one can establish an asymptotic formula of large deviation type. The rate function, which expresses the exponential decay rate, is explicitly given. Around the boundary of the support of the limit distribution (called the `wall'), the asymptotic formula is described in terms of the Airy function.

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