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Nonperturbative environmental influence on dephasing

  • Environmental noise leads to dephasing and relaxation in a quantum system. Often, a rigorous treatment of multiple noise sources within a system-bath approach is not possible. We discuss the influence of environmental fluctuations on a quantum system whose dynamics is dephasing already due to a phenomenologically treated additional noise source. For this situation, we develop a path-integral approach, which allows us to treat the system-environment coupling in a numerically exact way, and additionally we extend standard perturbative approaches. We observe strong deviations between the numerically exact and the perturbative results even for weak system-bath coupling. This shows that standard perturbative approaches fail for additional, even weak, system-bath couplings if the system dynamics is already dissipative.

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Metadaten
Author:Timo Palm, Peter Nalbach
DOI:https://doi.org/10.1103/PhysRevA.96.032105
ISSN:2469-9926
Parent Title (English):Physical Review A
Document Type:Article
Language:English
Date of Publication (online):2018/02/14
Year of first Publication:2017
Publishing Institution:Westfälische Hochschule Gelsenkirchen Bocholt Recklinghausen
Release Date:2018/02/14
Volume:96
Issue:3
First Page:032105
Departments / faculties:Fachbereiche / Wirtschaft und Informationstechnik Bocholt
Licence (German):License LogoEs gilt das Urheberrechtsgesetz

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