Perfect quantum excitation energy transport via single edge perturbation in a complete network

  • Hassan Bassereh
  • Vahid SalariEmail author
  • Farhad Shahbazi
  • Tapio Ala-Nissila
Regular Article


We consider quantum excitation energy transport (EET) in a network of two-state nodes in the Markovian approximation by employing the Lindblad formulation. We find that EET from an initial site, where the excitation is inserted to the sink, is generally inefficient due to the inhibition of transport by localization of the excitation wave packet in a symmetric, fully-connected network. We demonstrate that the EET efficiency can be significantly increased up to ≈100% by perturbing hopping transport between the initial node and the one connected directly to the sink, while the rate of energy transport is highest at a finite value of the hopping parameter. We also show that prohibiting hopping between the other nodes which are not directly linked to the sink does not improve the efficiency. We show that external dephasing noise in the network plays a constructive role for EET in the presence of localization in the network, while in the absence of localization it reduces the efficiency of EET. We also consider the influence of off-diagonal disorder in the hopping parameters of the network.


Statistical and Nonlinear Physics 


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Copyright information

© EDP Sciences, SIF, Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Hassan Bassereh
    • 1
  • Vahid Salari
    • 1
    • 2
    Email author
  • Farhad Shahbazi
    • 1
  • Tapio Ala-Nissila
    • 3
    • 4
  1. 1.Department of PhysicsIsfahan University of TechnologyIsfahanIran
  2. 2.School of Physics, Institute for Research in Fundamental Sciences (IPM)TehranIran
  3. 3.Department of Applied Physics and COMP CoEAalto University School of ScienceEspooFinland
  4. 4.Departments of Mathematical Sciences and Physics, Loughborough UniversityLeicestershireUK

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