@article{oai:oist.repo.nii.ac.jp:00002236,
 author = {Khalique, A and Sett, A and Wang, J B and Twamley, J},
 issue = {083005},
 journal = {New Journal of Physics},
 month = {Aug},
 note = {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 of vertices. We demonstrate that, for certain graph topology and phase matching conditions, we are able to direct the flow of probability amplitudes in a specific direction inside the graph network. We design a quantum walk graph analogue of an optical circulator which is a combination of a cycle and semi-infinite chain graphs. Excitations input into the circulator from a semi-infinite chain are routed in a directionally biased fashion to output to a different semi-infinite chain. We examine in detail a two port circulator graph which spatially separates excitations flowing back in forth between the two semi-finite chains to directionally occupy the top or bottom half of the cycle portion of the circulator. This setup can be used, for example, to detect non-Markovian processes, which leads to information and energy back-flow from the bath back into the system.},
 title = {Controlled information transfer in continuous-time chiral quantum walks},
 volume = {23},
 year = {2021}
}