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Paper   IPM / Physic / 17859
School of Physics
  Title:   Quantum speedup and non-Markovianity of an atom in structured reservoirs: pseudomodes as a good description of environmental memory
  Author(s): 
1.  M. Hadipour
2.  S. Haseli
3.  S. Haddadi
  Status:   Published
  Journal: Commun Theor Phys
  Vol.:  76
  Year:  2024
  Pages:   085105
  Supported by:  IPM
  Abstract:
Following the recent paper (Teittinen et al 2019 New J. Phys.21 123041), one can see that in general there is no simple relation between non-Markovianity and quantum speed limit. Here, we investigate the connection between quantum speed limit time and non-Markovianity of an atom in structured environments (reservoirs) whose dynamics is governed by an exact pseudomode master equation (Garraway 1997 Phys. Rev. A 55 2290). In particular, we find an inverse relation between them, which means that the non-Markovian feature of the quantum process leads to speedup of evolution. Thus, there is a link between quantum speedup and memory effects for specific cases of dynamical evolution. Our results might shed light on the relationship between the speedup of quantum evolution and the backflow of information from the environment to the system.

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