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Decoherence due to an excited-state quantum phase transition in a two-level boson model

AutorPérez-Fernández, P. ; Relaño, Armando; Arias, J. M.; Dukelsky, Jorge ; Garcia-Ramos, J.E.
Fecha de publicación17-sep-2009
EditorAmerican Physical Society
CitaciónPhysical review A 80: 032111 (2009)
ResumenThe 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. © 2009 The American Physical Society.
Descripción10 págs.; 8 figs.; 2 tabs.; PACS number s : 03.65.Yz, 05.70.Fh, 64.70.Tg
Versión del editorhttps://doi.org/10.1103/PhysRevA.80.032111
Identificadoresdoi: 10.1103/PhysRevA.80.032111
issn: 1050-2947
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