Artículo
Decoherence due to an excited-state quantum phase transition in a two-level boson model
Autor/es | Pérez Fernández, Pedro
Relaño, Armando Arias Carrasco, José Miguel Dukelsky, Jorge García Ramos, José Enrique |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear Universidad de Sevilla. Departamento de Física Aplicada III |
Fecha de publicación | 2009 |
Fecha de depósito | 2019-03-13 |
Publicado en |
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Resumen | 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 ... 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. |
Identificador del proyecto | FIS2008-04189
FIS2006-12783-C03-01 FPA2006- 13807-C02-02 FPA2007-63074 200650M012 FQM160 FQM318 P05-FQM437 P07- FQM-02962 |
Cita | Pérez Fernández, P., Relaño, A., Arias Carrasco, J.M., Dukelsky, J. y García Ramos, J.E. (2009). Decoherence due to an excited-state quantum phase transition in a two-level boson model. Physical Review A - Atomic, Molecular, and Optical Physics, 80 (3), 032111-. |
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