1209.3144 (C. M. Chandrashekar et al.)

Noise-enhanced quantum transport on a closed loop using quantum walks    [PDF]

C. M. Chandrashekar, Th. Busch

We study the effect of noise on the transport of a quantum state on a closed loop. Using a discrete-time quantum walk dynamics, we demonstrate that the transport efficiency is enhanced with noise when the number of sites in the loop is small and suppressed when the number of sites in the loop grows. By using the concept of measurement induced disturbance we identify the regimes in which genuine quantum effects are responsible for the enhanced transport.

View original: http://arxiv.org/abs/1209.3144