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@ARTICLE{Bode:1023797,
      author       = {Bode, Tim and Kajan, Michael and Meirinhos, Francisco and
                      Kroha, Johann},
      title        = {{N}on-{M}arkovian dynamics of open quantum systems via
                      auxiliary particles with exact operator constraint},
      journal      = {Physical review research},
      volume       = {6},
      number       = {1},
      issn         = {2643-1564},
      address      = {College Park, MD},
      publisher    = {APS},
      reportid     = {FZJ-2024-01810},
      pages        = {013220},
      year         = {2024},
      abstract     = {We introduce an auxiliary-particle field theory to treat
                      the non-Markovian dynamics of driven-dissipative quantum
                      systems of the Jaynes-Cummings type. It assigns an
                      individual quantum field to each reservoir state and
                      provides an analytic, faithful representation of the coupled
                      system-bath dynamics. We apply the method to a
                      driven-dissipative photon Bose-Einstein condensate (BEC)
                      coupled to a reservoir of dye molecules with electronic and
                      vibronic excitations. The complete phase diagram of this
                      system exhibits a hidden, non-Hermitian phase transition
                      separating temporally oscillating from biexponentially
                      decaying photon density correlations within the BEC. On one
                      hand, this provides a qualitative distinction of the thermal
                      photon BEC from a laser. On the other hand, it shows that
                      one may continuously tune from the BEC to the lasing phase
                      by circumventing a critical point. This auxiliary-particle
                      method is generally applicable to the dynamics of open,
                      non-Markovian quantum systems.},
      cin          = {PGI-12},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-12-20200716},
      pnm          = {5223 - Quantum-Computer Control Systems and Cryoelectronics
                      (POF4-522)},
      pid          = {G:(DE-HGF)POF4-5223},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001187633700003},
      doi          = {10.1103/PhysRevResearch.6.013220},
      url          = {https://juser.fz-juelich.de/record/1023797},
}