Artículo
Decoherence as a signature of an excited-state quantum phase transition
Autor/es | Relaño, Armando
Arias Carrasco, José Miguel Dukelsky, Jorge García Ramos, José Enrique Pérez Fernández, Pedro |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear Universidad de Sevilla. Departamento de Física Aplicada III |
Fecha de publicación | 2008 |
Fecha de depósito | 2019-03-28 |
Publicado en |
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Resumen | We analyze the decoherence induced on a single qubit by the interaction with a two-level boson system with critical internal dynamics. We explore how the decoherence process is affected by the presence of quantum phase ... We analyze the decoherence induced on a single qubit by the interaction with a two-level boson system with critical internal dynamics. We explore how the decoherence process is affected by the presence of quantum phase transitions in the environment. We conclude that the dynamics of the qubit changes dramatically when the environment passes through a continuous excited state quantum phase transition. If the system-environment coupling energy equals the energy at which the environment has a critical behavior, the decoherence induced on the qubit is maximal and the fidelity tends to zero with finite size scaling obeying a power law. |
Identificador del proyecto | FIS2005-01105
FIS2006-12783-C03-01 FPA2006- 13807-C02-02 FPA2007-63074 200650M012 FQM160 FQM318 P05-FQM437 P07-FQM-02962 |
Cita | Relaño, A., Arias Carrasco, J.M., Dukelsky, J., García Ramos, J.E. y Pérez Fernández, P. (2008). Decoherence as a signature of an excited-state quantum phase transition. Physical Review A - Atomic, Molecular, and Optical Physics, 78 (6), 060102-. |
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