RT Journal Article
T1 Decoherence as a signature of an excited state quantum phase transition
A1 Relaño Pérez, Armando
A1 Arias Carrasco, José Miguel
A1 Dukelsky, J.
A1 García Ramos, José Enrique
A1 Pérez Fernández, Pedro
K1 Bosones
AB We analyze the decoherence induced on a single qubit by the interaction with a two-level bosonsystem with critical internal dynamics. We explore how the decoherence process is affected bythe presence of quantum phase transitions in the environment. We conclude that the dynamics ofthe qubit changes dramatically when the environment passes through a continuous excited statequantum phase transition. If the system-environment coupling energy equals the energy at whichthe environment has a critical behavior, the decoherence induced on the qubit is maximal and thefidelity tends to zero with finite size scaling obeying a power-law.
PB American Physical Society
SN 1050-2947
YR 2008
FD 2008-12-16
LK http://hdl.handle.net/10272/5451
UL http://hdl.handle.net/10272/5451
LA eng
NO Relaño Pérez, A., Arias Carrasco, J.M., Dukelsky, J., García Ramos, J.E.: "Decoherence as a signature of an excited state quantum phase transition". Physical Review A . Vol. 78, n. 6 (2008). ISSN 1050-2947
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026