RT Journal Article
T1 Decoherence as a signature of an excited-state quantum phase transition
A1 Relaño Pérez, Armando
A1 Arias, J. M.
A1 Dukelsky, J.
A1 García Ramos, J. E.
A1 Pérez Fernández, P.
AB 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.
PB American Physical Society
SN 1050-2947
YR 2008
FD 2008-12
LK https://hdl.handle.net/20.500.14352/51266
UL https://hdl.handle.net/20.500.14352/51266
LA eng
NO © 2008 The American Physical Society. This work has been partially supported by the Spanish Ministerio de Educacion y Ciencia and by the European Regional Development Fund (FEDER) under Projects No. FIS2005-01105, No. FIS2006-12783-C03-01, No. FPA2006-13807-C02-02, and No. FPA2007-63074, by Comunidad de Madrid and CSIC under Project No. 200650M012, and by Junta de Analucia under Projects No. FQM160, No. FQM318, No. P05-FQM437, and No. P07-FQM-02962. A. R. was supported by the Spanish program "Juan de la Cierva," and P. P- F. by a grant from the Plan Propio of the University of Sevilla.
NO Ministerio de Educación y Ciencia
NO European Regional Development Fund (FEDER)
NO Comunidad de Madrid
NO CSIC
NO Junta de Andalucia
NO Spanish program "Juan de la Cierva,"
NO Plan Propio of the University of Sevilla
DS Docta Complutense
RD 27 abr 2025