Seminário de Computação e Informação Quântica 

25/10/2013, 15:00 — 16:00 — Sala P4.35, Pavilhão de Matemática
Leonardo Novo, Physics of Information Group - IT

Environment-assisted quantum walks in disordered graphs

We study quantum walks in different network structures. We model the quantum transport by a tight-binding hamiltonian with site-energies disorder, and the interaction with the environment by pure dephasing noise. Furthermore, we introduce losses and a trapping site in the structure and calculate numerically the transport efficiency to this site. We find that optimal efficiency is achieved when the time-scale associated with dephasing matches that of the site-to-site hopping.