Description of quantum dynamics of open systems based on collision-like models

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Master equations in the Lindblad form describe evolution of open quantum systems that is completely positive and simultaneously has a semigroup property. We analyze a possibility to derive this type of master equations from an intrinsically discrete dynamics that is modelled as a sequence of collisions between a given quantum system (a qubit) with particles that form the environment. In order to illustrate our approach we analyze in detail how a process of an exponential decay and a process of decoherence can be derived from a collision-like model in which particular collisions are described by SWAP and controlled-NOT interactions, respectively.
7pages, 3figures, to appear in Open Systems and Information Dynamics

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Quantum Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/95265

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/quant-ph/0410161
 http://arxiv.org/abs/quant-ph/0410161
 Open systems and information dynamics 12, No.1, pp. 81-91 (2005)

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arXiv