Krawtchouk matrices from classical and quantum random walks

Details Krawtchouk matrices from classical and quantum random walks Krawtchouk matrices from classical and quantum random walks

2007-02-16

arxiv.org/abs/quant-ph/0702173v1

Contemporary Mathematics, Volume 287 (2001) 83-96

Physics

Quantum Physics

There is a notational change (from Phi to K) from the published version

Scientific paper

Krawtchouk's polynomials occur classically as orthogonal polynomials with respect to the binomial distribution. They may be also expressed in the form of matrices, that emerge as arrays of the values that the polynomials take. The algebraic properties of these matrices provide a very interesting and accessible example in the approach to probability theory known as quantum probability. First it is noted how the Krawtchouk matrices are connected to the classical symmetric Bernoulli random walk. And we show how to derive Krawtchouk matrices in the quantum probability context via tensor powers of the elementary Hadamard matrix. Then connections with the classical situation are shown by calculating expectation values in the quantum case.

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