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García Ramos, J. E. ; Arias, J. M. ; Cejnar, P. ; Dukelsky, J. ; Pérez Fernández, P. ; Relaño Pérez, Armando | American Institute of Physics (AIP) | 2012We study the similarities and differences between the phenomena of Quantum Decoherence and Quantum Quench in presence of an Excited State Quantum Phase Transition (ESQPT). We analyze, on one hand, the decoherence induced on a single qubit by the[...]texto impreso
Pérez Fernández, P. ; Relaño Pérez, Armando ; Arias, J. M. ; Cejnar, P. ; Dukelsky, J. ; García Ramos, J. E. | American Physical Society | 2011-04-15We study the critical behavior of excited states and its relation to order and chaos in the Jaynes-Cummings and Dicke models of quantum optics. We show that both models exhibit a chain of excited-state quantum phase transitions demarcating the u[...]texto impreso
Pérez Fernández, P. ; Relaño Pérez, Armando ; Cejnar, P. ; Arias, J. M. ; Dukelsky, J. ; García Ramos, J. E. | American Institute of Physics (AIP) | 2012In this contribution, the critical behavior of excited state quantum phase transitions (ESQPT's) and its relation to order and chaos in the Dicke model are studied. This model is non-integrable. For comparison, the same problem is studied for th[...]texto impreso
Pérez Fernández, P. ; Cejnar, P. ; Arias, J. M. ; Dukelsky, J. ; García Ramos, J. E. ; Relaño Pérez, Armando | American Physical Society | 2011-03-03We analyze excited-state quantum phase transitions (ESQPTs) in three schematic (integrable and nonintegrable) models describing a single-mode bosonic field coupled to a collection of atoms. It is shown that the presence of the ESQPT in these mod[...]
