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@ARTICLE{Novotny:283596,
      author       = {Novotny, M. A. and Jin, F. and Yuan, S. and Miyashita, S.
                      and De Raedt, H. and Michielsen, K.},
      title        = {{Q}uantum decoherence and thermalization at finite
                      temperature within the canonical-thermal-state ensemble},
      journal      = {Physical review / A},
      volume       = {93},
      number       = {3},
      issn         = {2469-9926},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2016-01906},
      pages        = {032110},
      year         = {2016},
      abstract     = {We study measures of decoherence and thermalization of a
                      quantum system S in the presence of a quantum environment
                      (bath) E. The entirety S+E is prepared in a
                      canonical-thermal state at a finite temperature; that is,
                      the entirety is in a steady state. Both our numerical
                      results and theoretical predictions show that measures of
                      the decoherence and the thermalization of S are generally
                      finite, even in the thermodynamic limit, when the entirety
                      S+E is at finite temperature. Notably, applying perturbation
                      theory with respect to the system-environment coupling
                      strength, we find that under common Hamiltonian symmetries,
                      up to first order in the coupling strength it is sufficient
                      to consider S uncoupled from E, but entangled with E, to
                      predict decoherence and thermalization measures of S. This
                      decoupling allows closed-form expressions for perturbative
                      expansions for the measures of decoherence and
                      thermalization in terms of the free energies of S and of E.
                      Large-scale numerical results for both coupled and uncoupled
                      entireties with up to 40 quantum spins support these
                      findings.},
      cin          = {JSC / JARA-HPC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JSC-20090406 / $I:(DE-82)080012_20140620$},
      pnm          = {511 - Computational Science and Mathematical Methods
                      (POF3-511) / Manipulation and dynamics of quantum spin
                      systems $(jjsc09_20120501)$},
      pid          = {G:(DE-HGF)POF3-511 / $G:(DE-Juel1)jjsc09_20120501$},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000371724100003},
      doi          = {10.1103/PhysRevA.93.032110},
      url          = {https://juser.fz-juelich.de/record/283596},
}