What is random about a quantum random walk?

Details What is random about a quantum random walk? What is random about a quantum random walk?

2003-05-06

arxiv.org/abs/quant-ph/0305026v1

Physics

Quantum Physics

14 pgs, 6 figures, Revtex4

Scientific paper

We use simple deterministic dynamical systems as coins in studying quantum walks. These dynamical systems can be chosen to display, in the classical limit, a range of behaviors from the integrable to chaotic, or deterministically random. As an example of an integrable coin we study the Fourier walk that generalizes the Hadamard walk and show that the walker slows down with coin dimensionality, which controls the effective Planck constant. Introducing multi-Harper maps as deterministic models of random walks we study the effect of coin chaos on the quantum walk. We also demonstrate that breaking time-reversal symmetry in the coin dynamics effectively slows down the walk.

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