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Paper   IPM / Physic / 14940
School of Physics
  Title:   Non-Markovian Dynamics of Macroscopic Quantum Systems in Interaction with Non-Equilibrium Environments
1.  N. Shahmansoori
2.  F. Taher Ghahramani
3.  A. Shafiee
  Status:   Published
  Journal: J. Stat. Phys.
  Vol.:  176
  Year:  2019
  Pages:   541-555
  Supported by:  IPM
We study the dynamics of a macroscopic superconducting qubit coupled to two independent non-stationary reservoirs by using time-dependent perturbation theory. Our results show that a single equilibrium environment surpasses completely the coherent evolution of the macroscopic qubit. When the qubit couples to two different reservoirs, exemplifying a non-equilibrium environment, the short-time dynamics is affected by the interference between two reservoirs, implying the non-additivity of effects of two reservoirs. The non-additivity can be traced back to a non-Markovian effect, even though two reservoirs are independently assumed to be Markovian. Explicitly, the non-equilibrium environment intensifies both coherent and incoherent parts of the evolution. Therefore, the macroscopic system would evolve more coherently but at the price of a shorter decoherence time.

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