<div class="csl-bib-body">
<div class="csl-entry">Käding, C. (2023, March 8). <i>Directly computing reduced density matrices with influence functionals</i> [Presentation]. Central European Institute for Cosmology and Fundamental Physics Seminar 2023, Prag, Czechia.</div>
</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/191512
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dc.description.abstract
The field theory of open quantum systems has ample applications in areas like particle or nuclear physics, cosmology and quantum gravity. Open quantum systems are commonly described by reduced density matrices, which are obtained by tracing out the environmental degrees of freedom, and whose evolution is given by quantum master equations. Solving such equations often poses an intricate or even analytically impossible task. As a way to circumvent such problems, we will present a first principle-based and practicable formalism which allows for the direct computation of reduced density matrix elements without having to consider a master equation. It is based on techniques from non-equilibrium quantum field theory like thermo field dynamics, the Schwinger-Keldysh formalism and the Feynman-Vernon influence functional. As a simple example, we will focus on a scalar field system interacting with an environment
comprised of another scalar field.
en
dc.language.iso
en
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dc.subject
density matrices
en
dc.subject
open quantum systems
en
dc.subject
quantum field theory
en
dc.title
Directly computing reduced density matrices with influence functionals
en
dc.type
Presentation
en
dc.type
Vortrag
de
dc.type.category
Presentation
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tuw.publication.invited
invited
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tuw.researchTopic.id
Q6
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tuw.researchTopic.id
X1
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tuw.researchTopic.id
Q2
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tuw.researchTopic.name
Quantum Many-body Systems Physics
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tuw.researchTopic.name
Beyond TUW-research foci
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tuw.researchTopic.name
Quantum Metrology and Precision Measurements
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tuw.researchTopic.value
70
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tuw.researchTopic.value
20
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tuw.researchTopic.value
10
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tuw.publication.orgunit
E141-04 - Forschungsbereich Neutron- and Quantum Physics
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tuw.author.orcid
0000-0002-1781-2609
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tuw.event.name
Central European Institute for Cosmology and Fundamental Physics Seminar 2023
en
tuw.event.startdate
08-03-2023
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tuw.event.enddate
08-03-2023
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tuw.event.online
On Site
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tuw.event.type
Event for scientific audience
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tuw.event.place
Prag
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tuw.event.country
CZ
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tuw.event.institution
CEICO, Czech Academy of Sciences
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tuw.event.presenter
Käding, Christian
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wb.sciencebranch
Physik, Astronomie
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wb.sciencebranch.oefos
1030
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wb.sciencebranch.value
100
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item.cerifentitytype
Publications
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item.languageiso639-1
en
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item.openairecristype
http://purl.org/coar/resource_type/R60J-J5BD
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item.grantfulltext
restricted
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item.fulltext
no Fulltext
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item.openairetype
conference presentation
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crisitem.author.dept
E141-04 - Forschungsbereich Neutron- and Quantum Physics