期刊
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
卷 57, 期 11-12, 页码 1094-1102出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/prop.200900087
关键词
Quantum state transfer; quantum information
资金
- EU IP SCALA
- Spanish MEC [FIS 2008-/01236]
- Spanish Ministry of Education
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. (C) WILEY-VCH GmbH & Co. KGaA, Weinheim
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