Controlled information transfer in continuous-time chiral quantum walks

Abstract In this paper we investigate properties of continuous time chiral quantum walks, which possess complex valued edge weights in the underlying graph structure, together with an initial Gaussian wavefunction spread over a number vertices. We demonstrate that, for certain topology and phase matching conditions, are able to direct flow probability amplitudes specific direction inside network. design walk analogue optical circulator is combination cycle semi-infinite chain graphs. Excitations input into from routed directionally biased fashion output different chain. examine detail two port spatially separates excitations flowing back forth between semi-finite chains occupy top or bottom half portion circulator. This setup can be used, example, detect non-Markovian processes, leads information energy back-flow bath system.