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Non-Markovian dynamics of macroscopic quantum systems in interaction with non-equilibrium environments

Shahmansoori, N ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1007/s10955-019-02308-1
  3. Publisher: Springer New York LLC , 2019
  4. Abstract:
  5. We study the dynamics of a macroscopic superconducting qubit coupled to two independent non-stationary reservoirs by using time-dependent perturbation theory. We show that an equilibrium environment surpasses the coherent evolution of the macroscopic qubit completely. 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 qubit would evolve more coherently but at the price of a shorter decoherence time. © 2019, Springer Science+Business Media, LLC, part of Springer Nature
  6. Keywords:
  7. Macroscopic quantum systems ; Non-equilibrium environment ; Non-Markovian dynamics ; Superconducting qubit
  8. Source: Journal of Statistical Physics ; Volume 176, Issue 3 , 2019 , Pages 541-555 ; 00224715 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s10955-019-02308-1