Quantum random walks in one dimension

Details Quantum random walks in one dimension Quantum random walks in one dimension

2002-06-10

arxiv.org/abs/quant-ph/0206053v5

Quantum Information Processing, Vol.1, Issue 5, pp.345-354 (2002)

Physics

Quantum Physics

9 pages, journal reference added

Scientific paper

This letter treats the quantum random walk on the line determined by a 2 times 2 unitary matrix U. A combinatorial expression for the mth moment of the quantum random walk is presented by using 4 matrices, P, Q, R and S given by U. The dependence of the mth moment on U and initial qubit state phi is clarified. A new type of limit theorems for the quantum walk is given. Furthermore necessary and sufficient conditions for symmetry of distribution for the quantum walk is presented. Our results show that the behavior of quantum random walk is striking different from that of the classical ramdom walk.

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