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Non-Markovian thermalisation of a two-level atom
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
2006 (English)In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 259, no 2, 772-780 p.Article in journal (Refereed) Published
Abstract [en]

We consider thermalisation and spontaneous decay of a two-level atom beyond the Markovian approximation. While the standard elimination of the continuum of radiation modes results in exponential decay represented by a Lindblad equation of motion, we use a simple toy model that takes into account the finite relaxation rate of the environment and present an exact non-Markovian master equation of the Nakajima-Zwanzig form. Because the exact derivation of non-Markovian equations has proved very difficult for all more realistic (and hence much more complicated) models, we analyze the master equation obtained and also discuss difficulties that are likely to arise with non-Markovian evolution operators.

Place, publisher, year, edition, pages
2006. Vol. 259, no 2, 772-780 p.
Keyword [en]
open quantum systems, non-Markovian master equations
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-37607DOI: 10.1016/j.optcom.2005.09.057ISI: 000235643100060ScopusID: 2-s2.0-31644436848OAI: diva2:434462
Available from: 2011-08-15 Created: 2011-08-15 Last updated: 2011-08-15Bibliographically approved

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