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oai:digital.csic.es:10261/14960
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com_10261_135
com_10261_4
col_10261_388
http://hdl.handle.net/10261/14960
http://dx.doi.org/10.1103/PhysRevA.78.060102
14543
Decoherence as a signature of an excited-state quantum phase transition
American Physical Society
2008
Relaño, Armando
Arias, J. M.
Dukelsky, Jorge
García Ramos, José Enrique
Pérez-Fernández, P.
[PACS] Decoherence; open systems; quantum statistical methods
[PACS] Phase transitions: general studies
[PACS] Quantum phase transitions
2008-12-16
4 pages, 4 figures.-- PACS nrs.: 03.65.Yz; 64.70.Tg; 05.70.Fh.
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.
openAccess
Physical Review A
2008
78
060102