Non-Markovian decoherence: A critique of the two-level approximation
Date
2006
Authors
Hakioǧlu T.
Savran, K.
Sevinçli, H.
Meşe, E.
Editor(s)
Advisor
Supervisor
Co-Advisor
Co-Supervisor
Instructor
Source Title
Journal of Magnetism and Magnetic Materials
Print ISSN
0304-8853
Electronic ISSN
1873-4766
Publisher
Elsevier B.V.
Volume
300
Issue
1
Pages
e579 - e584
Language
English
Type
Journal Title
Journal ISSN
Volume Title
Series
Abstract
The environmental decoherence in multilevelled systems in the context of two-level approximation is examined. It is found that the environmental temperature plays a minor role in the magnitudes of the decoherence rates whereas, the system-environment coupling and the environmental energy spectrum are dominant. Particularly, the latter is important in zero temperature quantum fluctuations and/or the nonequilibrium noise sources due to the large range of energies present in the environmental modes. Decoherence is found to be dominated by the short time nonresonant processes and this observation severely questions the use of the two-levelled models on decoherence.