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Título:
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Decoherence due to an excited-state quantum phase transition in a two-level boson model
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Autores:
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Relaño Pérez, Armando ;
Pérez Fernández, P. ;
Arias, J. M. ;
Dukelsky, J. ;
García Ramos, J. E.
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Tipo de documento:
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texto impreso
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Editorial:
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American Physical Society, 2009-09
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Termodinámica
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Tipo = Artículo
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Resumen:
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The decoherence induced on a single qubit by its interaction with the environment is studied. The environment is modeled as a scalar two-level boson system that can go through either first-order or continuous-excited-state quantum phase transitions, depending on the values of the control parameters. A mean-field method based on the Tamm-Damkoff approximation is worked out in order to understand the observed behavior of the decoherence. Only the continuous-excited-state phase transition produces a noticeable effect in the decoherence of the qubit. This is maximal when the system-environment coupling brings the environment to the critical point for the continuous phase transition. In this situation, the decoherence factor (or the fidelity) goes to zero with a finite-size scaling power law.
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En línea:
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https://eprints.ucm.es/id/eprint/27582/1/Relano22libre.pdf
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