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Optimal electron propagation on a quantum chain by a topological phase

AutorPaganelli, Simone; Giorgi, Gian Luca ; Pasquale, Ferdinando de
Palabras claveQuantum Physics
Fecha de publicación22-jul-2009
CitaciónarXiv:0907.3833v1 [quant-ph]
ResumenWe 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.
Descripción8 pages, 6 figures.-- Published in Fortschritte der Physik 57(11-12): 1094-1102 (2009).-- http://dx.doi.org/10.1002/prop.200990010
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