Entanglement and Dynamics of Spin Chains in Periodically Pulsed Magnetic Fields: Accelerator Modes

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T. Boness, S. Bose, and T. S. Monteiro
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom

Received 23 February 2006; published 9 May 2006

Westudy the dynamics of a single excitation in a Heisenbergspin-chain subjected to a sequence of periodic pulses from anexternal, parabolic, magnetic field. We show that, for experimentally reasonableparameters, a pair of counterpropagating coherent states is ejected fromthe center of the chain. We find an illuminating correspondencewith the quantum time evolution of the well-known paradigm ofquantum chaos, the quantum kicked rotor. From this we cananalyze the entanglement production and interpret the ejected coherent statesas a manifestation of the so-called "accelerator modes" of aclassically chaotic system.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.96.187201
DOI:	10.1103/PhysRevLett.96.187201
PACS:	75.10.Pq; 03.67.Hk; 03.67.Mn; 05.45.Mt 75.10.Pq Spin chain models of magnetic ordering 03.67.Hk Quantum communication 03.67.Mn Quantum entanglement production, characterization, and manipulation 05.45.Mt Semiclassical methods in quantum chaos YEAR: 2006
KEYWORDS:	chaos, Heisenberg model, quantum entanglement

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Phys. Rev. Lett. 96, 187201 (2006) [4 pages]

Entanglement and Dynamics of Spin Chains in Periodically Pulsed Magnetic Fields: Accelerator Modes

REFERENCES (19)

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A new free weekly publication from APS