Perfect quantum excitation energy transport via single edge perturbation in a complete network Hassan Bassereh, Vahid Salari, Farhad Shahbazi and Tapio Ala-Nissila Eur. Phys. J. B, 90 6 (2017) 111 Published online: 14 June 2017 DOI: 10.1140/epjb/e2017-80048-1