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arXiv · 1705.10303

Analytical expression for variance of homogeneous-position quantum walk with decoherent position

Mostafa Annabestani
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Abstract

We have derived an analytical expression for variance of homogeneous-position decoherent quantum walk (HPDQW) with general form of noise on its position, and have shown that, while the quadratic ($t^2$) term of variance never changes by position decoherency, the linear term ($t$) does and always increases the variance. We study the walker with ability to tunnel out to $d$ nearest neighbors as an example and compare our result with former studies. We also show that, although our expression have been derived for asymptotic case, the rapid decay of time-dependent terms cause the expressions to be correct with a good accuracy even after dozens of steps.

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Mostafa Annabestani. 2017-09-19. Analytical expression for variance of homogeneous-position quantum walk with decoherent position. https://doi.org/10.1007/s11128-017-1802-9

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