@article{10272/5450,
year = {2009},
month = {9},
url = {http://hdl.handle.net/10272/5450},
abstract = {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.},
publisher = {American Physical Society},
keywords = {Bosones},
keywords = {Quanta, Teoría de los},
title = {Decoherence due to an excited state quantum phase transition in a two-level boson model},
author = {Pérez Fernández, Pedro and Relaño Pérez, Armando and Arias Carrasco, José Miguel and Dukelsky, J. and García Ramos, José Enrique},
}