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The Landau-Zener Model with Decoherence: The case S=1/2

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arxiv quant-ph/0203110 v1 pith:2IFLIYEB submitted 2002-03-21 quant-ph

The Landau-Zener Model with Decoherence: The case S=1/2

V. G. Benza (Universita' dell'Insubria , Como , also I.N.F.M. , unita' di Como) , G. Strini (Universita' di Milano) This is my paper
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keywords casedecoherencelandau-zeneroscillatingspinaccountbehaviorbias
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We study the dynamics of a spin coupled to an oscillating magnetic field, in the presence of decoherence and dissipation. In this context we solve the master equation for the Landau-Zener problem, both in the unitary and in the irreversible case. We show that a single spin can be "magnetized" in the direction parallel to the oscillating bias. When decay from upper to lower level is taken into account, hysteretic behavior is obtained.

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