Spacetime structures of continuous-time quantum walks

Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Mar;71(3 Pt 2A):036128. doi: 10.1103/PhysRevE.71.036128. Epub 2005 Mar 22.

Abstract

The propagation by continuous-time quantum walks (CTQWs) on one-dimensional lattices shows structures in the transition probabilities between different sites reminiscent of quantum carpets. For a system with periodic boundary conditions, we calculate the transition probabilities for a CTQW by diagonalizing the transfer matrix and by a Bloch function ansatz. Remarkably, the results obtained for the Bloch function ansatz can be related to results from (discrete) generalized coined quantum walks. Furthermore, we show that here the first revival time turns out to be larger than for quantum carpets.