Quantum transport and spin dynamics on shearless tori

Details Quantum transport and spin dynamics on shearless tori Quantum transport and spin dynamics on shearless tori

2007-11-28

arxiv.org/abs/0711.4395v3

Phys. Rev. E 77, 055203(R) (2008)

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevE.77.055203

We investigate for quantum dynamics in phase-space regions containing ``shearless tori''. We show that the properties of these peculiar classical phase-space structures -- important to the dynamics of tokamaks -- may be exploited for quantum information applications. In particular we show that shearless tori permit the non-dispersive transmission of localized wavepackets. The quantum many-body Hamiltonian of a Heisenberg ferromagnetic spin chain, subjected to an oscillating magnetic field, can be reduced to a classical one-body ``image'' dynamical system which is the well-studied Harper map. The Harper map belongs to a class of Hamiltonian systems (non-twist maps) which contain shearless tori. We show that a variant with sinusoidal time driving ``driven Harper model'' produces shearless tori which are especially suitable for quantum state transfer. The behavior of the concurrence is investigated as an example.

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