umu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Dissipative Quantum Dynamics and Decoherence
Umeå University, Faculty of Science and Technology, Department of Physics.
2011 (English)Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Abstract This thesis has two parts, in the first, the Caldeira-Leggett model is introduced; its derivation and general consequences are explored following a paper by Caldeira and Leggett[1]. An operator-formalism shortcut through some of the more mathematically cumbersome parts of the derivation of the model is also developed. The correlation of the force resulting from reservoir-interaction is examined in the high- and low-temperature limits, and the Langevin equation is shown to emerge in the classical limit.Abstract The second part introduces decoherence through a thought experiment that demonstrates the destructive effect of random phase shifts on interference terms, and then follows another paper by Caldeira and Leggett[2] in applying their model further to study the phenomenon of dissipative decoherence. The time-evolution of the interference terms in a superposition of Gaussian wave packets in a harmonic oscillator potential is studied when interacting with a heat bath, and they are shown to vanish at a rate much faster than the relaxation of the system.

Place, publisher, year, edition, pages
2011. , 85 p.
Keyword [en]
decoherence, quantum mechanics, dissipation, caldeira-leggett
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-44341OAI: oai:DiVA.org:umu-44341DiVA: diva2:420243
Uppsok
Technology
Supervisors
Examiners
Available from: 2011-06-13 Created: 2011-05-31 Last updated: 2011-06-13Bibliographically approved

Open Access in DiVA

fulltext(615 kB)506 downloads
File information
File name FULLTEXT01.pdfFile size 615 kBChecksum SHA-512
0e9ee4d06bbb6ca3a6ae200f94f578505cb61fcc000e630fb232361b63fa5e41dd4abd4949e6199f25429432f4db41a7d40ecebf4adf7d2bd36d6a5e9a257469
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Löfgren, Viktor
By organisation
Department of Physics
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 506 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 152 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf