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

Hassan Bassereh, Vahid Salari*, Farhad Shahbazi, Tapio Ala-Nissilä

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)


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.

Original languageEnglish
Article number111
JournalEuropean Physical Journal B
Issue number6
Publication statusPublished - 1 Jun 2017
MoE publication typeA1 Journal article-refereed


  • Statistical and Nonlinear Physics

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