Optimal electron propagation on a quantum chain by a topological phase

Details Optimal electron propagation on a quantum chain by a topological phase Optimal electron propagation on a quantum chain by a topological phase

2009-07-22

arxiv.org/abs/0907.3833v3

Fortschr. Phys. 57, 1094 (2009)

Physics

Quantum Physics

8 pages, 6 figures

Scientific paper

10.1002/prop.200900087

We study the quantum diffusion of an electron in a quantum chain starting from an initial state localized around a given site. As the wavepacket diffuses, the probability of reconstructing the initial state on another site diminishes drastically with the distance. In order to optimize the state transmission we find that a topological quantum phase can be introduced. The effect of this phase is the reduction of wavepacket spreading together with almost coherent group propagation. In this regime, the electron has a quasi-linear dispersion and high fidelity can be achieved also over large distances in terms of lattice spacing.

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