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Decoherence as a Signature of an Excited State Quantum Phase Transition in Two Level Boson Systems

 

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Opened Access Decoherence as a Signature of an Excited State Quantum Phase Transition in Two Level Boson Systems
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Author: García Ramos, José Enrique
Arias Carrasco, José Miguel
Dukelsky, Jorge
Pérez Fernández, Pedro
Relaño, Armando
Department: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Date: 2009
Published in: International Conference on Nuclear Structure and Dynamics '09 (2009), p 207-210
ISBN/ISSN: 978-073540702-2
0094-243X
1551-7616
Document type: Presentation
Abstract: 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.
Cite: García Ramos, J.E., Arias Carrasco, J.M., Dukelsky, J., Pérez Fernández, P. y Relaño, A. (2009). Decoherence as a Signature of an Excited State Quantum Phase Transition in Two Level Boson Systems. En International Conference on Nuclear Structure and Dynamics '09 (207-210), Dubrovnik; Croatia: American Institute of Physics.
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Format: PDF

URI: https://hdl.handle.net/11441/84830

DOI: 10.1063/1.3232073

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