Slowdown of nonequilibrium dynamics in gapped `qubit' chains

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dc.creatorTygel, D.
dc.creatorCarvalho, J. G.
dc.creatorCabrera, G. G.
dc.date2004-02-11
dc.date.accessioned2026-07-07T02:56:26Z
dc.date.available2026-07-07T02:56:26Z
dc.descriptionWe solve the nonequilibrium dynamics of qubits or quantum spin chains (s=1/2) modeled by an anisotropic XY Hamiltonian, when the initial condition is prepared as a spatially inhomogeneous state of the magnetization. Infinite systems are studied analytically, yielding a universal relaxation driven by quantum fluctuations. Particular long-lived excitations are found, for which the relaxation time diverges as a consequence of constructive quantum interference at degenerate stationary points. Those states are intrinsically entangled and may be of interest for performing quantum computation. We also numerically analyze finite samples to assess the extent of size effects.
dc.description12 pages and 3 figures in postscript format. PACS numbers: 75.10.Jm, 76.20.+q, 03.67.Lx
dc.identifierhttps://arxiv.org/abs/cond-mat/0402313
dc.identifierhttp://arxiv.org/abs/cond-mat/0402313
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/23320
dc.subjectMesoscale and Nanoscale Physics
dc.subjectStrongly Correlated Electrons
dc.titleSlowdown of nonequilibrium dynamics in gapped `qubit' chains
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