A critique of the two level approximation
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Tarih
2006
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer New York
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The conditions in favor and necessity of a realistic multileveled description of a decohering quantum system is examined. Under these conditions approximate techniques to simplify a multileveled system by its first two levels is unreliable and a realistic multilevel description in the formulation of decoherence is unavoidable. In this regard, the first crucial observation is that, the validity of the two level approximation of a multileveled system is not controlled purely by sufficiently low temperatures. That the type of system-environment coupling and the environmental spectrum have a dominant role over the temperature is demonstrated. Particularly, zero temperature quantum fluctuations induced by the Caldeira-Leggett type linear coordinate coupling can be influential in a wide energy range in the systems allowed transitions. The second crucial observation is that the decoherence times being among the system's short time scales are found to be dominated not by the resonant but non-resonant processes.
Açıklama
Anahtar Kelimeler
Kaynak
Quantum Computing in Solid State Systems
WoS Q Değeri
Scopus Q Değeri
N/A
Cilt
Sayı
Künye
Hakioǧlu, T., Savran, K. ve Meşe, E. (2006). A critique of the two level approximation. Quantum Computing in Solid State Systems, 127-136.
